Questions tagged [co2]

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2answers
76 views

Could increased $\ce{CO2}$ levels be a contributing factor why dinosaurs grew so big?

Is it possible that increased CO2 levels during the larger dinosaurs era is a major factor in why dinosaurs grew so big during this period? And extrapolating this question, is it possible that the ...
4
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2answers
195 views

How to explain the remarkable regularity of the increased concentration of atmospheric carbon dioxide?

The Keeling curve is very well approximated with an exponential function with an offset $256$ [ppm] $$256+A\cdot e^{\alpha\cdot t}$$ where $A=1.095\cdot10^{-12}$ and $\alpha=0.0161$ ($t$ is in years ...
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0answers
45 views

Alternative natural explanations for rise in atmospheric CO2? [duplicate]

I am in no way a climate-change skeptic, nor a denier. Motivated by this question and some articles I read online: Are there any known natural processes beside human activities that are able to ...
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2answers
921 views

Is volume of air increasing as CO2 levels increase?

CO2 levels are increasing, they have crossed 400 ppm, which means that of every million gas molecules in the air, 400 are of CO2. It has been increasing. Does that mean the total volume of air in the ...
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1answer
91 views

How is causality between past CO$_2$ levels and fossilized plant pores proxies established?

According to Mann and Kump (2015), Geologic proxies are characteristics of sedimentary rocks that we can use to infer ancient environmental conditions. Climate scientists study proxies because there ...
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6answers
4k views

Carbon dioxide on Mars, Venus and Earth

Earth's atmosphere is 0.038% carbon dioxide. Mars's atmosphere is 95.3% carbon dioxide. Venus's atmosphere is 96.5% carbon dioxide. If Earth's climate is controlled by CO2, then why is Mars so cold ...
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0answers
826 views

How are Mauna Loa $\ce{CO2}$ monthly trends computed?

The problem I am trying to figure out how $\ce{CO2}$ concentration trends are computed in the data provided by the Earth Systems Research Laboratory Mauna Loa Observatory. The data contains monthly ...
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4answers
702 views

How hot the earth will be if we have 20% CO2 in the atmosphere instead of ~0.04? and how cold would it be if doesn't have any CO2?

I know Earth once had this amount in the past, but if we got the former atmosphere with around 20% of CO2, how much the temperature will rise? assuming the atmosphere is still dominated by 78% ...
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1answer
128 views

Is anthropogenic global warming unavoidable under modern civilisation? [closed]

Which are the reasons to believe that the climate crisis can be solved within our type of civilisation, that is, without putting in jeopardy the important advances of humanity that have been achieved ...
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4answers
2k views

Why are CO2 sensors so expensive when CO sensors aren't?

Please excuse me if Earth Science is not the correct place to ask this question. I read a New York Times article about increasing $\small\mathsf{CO_2}$ levels in the atmosphere: "Carbon in Atmosphere ...
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2answers
114 views

Can we run out of air because of global warming?

Can it be that our air will be unbreathable in a few years due to CO2 emission? I think I may suffer from global warming anxiety and I accuse CO2 for my shortness of breath. Is it rational?
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2answers
347 views

When would the earth run out of carbon dioxide without man made climate change?

One of my friends told me quite seriously that Gaia had evolved humans to burn the fossil fuels and thus stop the earth running out of CO2. Leaving aside the obvious nonsense it did raise an ...
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7answers
5k views

Does climate change cause increase in CO2?

My main question is how do we know that increase in global temperature does not CAUSE an increase in CO2 concentration? I am trying to develop my mental model of what's going on for the climate ...
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1answer
141 views

Do carbon dioxide hydrates exist in nature?

Do CO2 hydrates exist in nature? If so, how much carbon could they contain?
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0answers
16 views

Calculating carbon sequestration on the percentage of tree cover

What variables are necessary to calculate carbon sequestration on densely population tree cover over a large spatial range? I wish to work on a project that has been proposed to me and my team at work....
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2answers
140 views

Why is Belgium (and Luxembourg, Switzerland, Austria, Norway) still above consumption CO2 levels per capita of 1990? While many others did go down

"Consumption-based emissions reflect the consumption and lifestyle choices of a country’s citizens." Via this article https://ourworldindata.org/consumption-based-co2 I see that Belgium's ...
4
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1answer
82 views

Are small reductions in CO2 emissions better than no reductions, in terms of mitigating climate change?

My understanding of climate change is that a large increase in human-caused CO2 emissions is likely to lead to large change in the Earth's climate through a global warming effect. Scientific consensus ...
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0answers
58 views

How to convert CO2 emission from gC/m2/day to Tonnes?

I have an ODIAC Global CO2 emission dataset. The dataset is provided in netCDF (.nc) format and the resolution of the dataset is 1x1 degree. The unit of the dataset is gC/m2/day. I need to convert it ...
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1answer
64 views

How to convert mol m-2 s-1 CO2 emission to Megaton day-1 (MtCO2 per day)?

I am working on the global CO2 emission using a model dataset. The model provides the CO2 emission in mol m-2 s-1. How to convert mol m-2 s-1 CO2 emission to Megaton day-1 (Mt per day)? Regards
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2answers
137 views

Are wetlands effective against climate change?

In the region where I live, there is a trend that conservation organizations are advocating the conservation and re-valuation of wetlands. Aside from boosting biodiversity and providing other ...
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1answer
73 views

Why don't we store carbon by storing used plastics under ground?

Some types of used plastics are very stable. They also contain a significant amount of carbon. An example is polyethylene (PE). When waste is collected for recycling, not every plastic part can be ...
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0answers
218 views

Can the absorbtion of infrared around the 650 wavenumber in water be a substantial cause of converting that spectrum range into other spectra?

CO2 absorbs around the 15 microns wavelenght or wavenumber 650, and radiates in the same but also a somewhat wider range. However, the top layer of the oceans seem to also convert that spectrum range. ...
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3answers
6k views

Does rain (temporarily) deplete the surrounding atmosphere of carbon dioxide?

CO2 in the air dissolves into rain water, making them slightly acidic. Is that enough to deplete the surrounding air out of CO2? If yes, how fast does this occur? Is it only with the first drops of ...
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1answer
42 views

What potential geoengineering technologies could help a country "achieve its Paris (agreement) targets"?

CNN's China to expand weather modification program to cover area larger than India ends with the following sentence: "While China has not yet shown signs of 'unilaterally' deploying ...
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0answers
34 views

How would I compare (CO$_2$-eq) kg$^{−1}$ with metric tons?

I'm doing a project and looking at one of my scholarly resources, it says that The carbon footprint per kilogram protein of plant-based substitutes was found in the range of 6–17 carbon dioxide ...
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0answers
48 views

What is the carbon footprint of Spacex's plan for earth-to-earth transport plan compared to commercial aviation?

According to many articles around the web as well as the SpaceX official website (https://www.spacex.com/human-spaceflight/earth/index.html), Elon Musk plans to replace intercontinental flights with ...
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4answers
191 views

Review of calculation of CO$_2$ contribution to warming

In a Swedish Facebook group for "climate change skeptics" Erik Larsen has shared his calculation of how big part of temperature change can be attributed to human emissions of carbon dioxide. ...
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0answers
33 views

CO2 probe measuring at temperatures up to 150 °C [closed]

I'm looking for a $CO_2$ measuring probe (analog current output, digital out: RS232/485 - probe will be connected and transferring real time data to the data logger) that would operate up to 150 °C (...
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5answers
365 views

How will increased $\ce{CO2}$ affect forests and other vegetative areas?

Some researchers contend that increases in atmospheric CO2 (e.g., from anthropogenic emissions) will enhance plant growth in general. What is the level of that enhancement? Does the associated ...
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2answers
194 views

Is the net amount of CO2 sequestered by trees from the atmosphere simply related to the mass of new growth?

My simplistic model for the carbon cycle was that plants (or trees in particular) photosynthesise and transpire. The former takes up $\small\mathsf{CO_2}$ and $\small\mathsf{H_2O}$ and the latter does ...
5
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1answer
149 views

Carbon dioxide and ocean acidification based on temperature

For our assignment, we are required to analyse and compare the $\ce{CO2}$ level (in both ocean and air) of two different sites. Theoretically, shouldn't the $\ce{CO2}$ level of a colder region (e.g., ...
4
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1answer
711 views

The effect of CO2 concentration on the pH of the ocean

I'm confused about how increased $\ce{CO2}$ concentration in the atmosphere affects the pH of the ocean. The increase in $\ce{CO2}$ concentration means the pH of the ocean will decrease (by several ...
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1answer
51 views

Is CO2 in the Pacific Ocean depleted or enriched in Carbon-13 compared to the Atlantic, and why?

Due to thermohaline circulation, the Pacific water is more 'aged' so there is a higher amount of total dissolved inorganic carbon (e.g. CO2) in the deep Pacific when compared to the Atlantic. However, ...
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1answer
147 views

Do trees capture more CO2 during a fast growth stage?

I understand that trees capture CO2 from the air and use that carbon to grow. As trees reach mature height, do they begin to capture less CO2 as they would only need carbon for "maintenance" as ...
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2answers
300 views

How has the increase in global CO2 been attributed to an anthropogenic cause?

How has the increase in global CO2 been attributed to an anthropogenic cause? It would seem to me that this could be definitively determined on the basis of placing gas spectrometers on the exhausts ...
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1answer
148 views

Greenhouse gas emissions from wildfires in California

According to the California Air Resources Board, in 2016 (the most recent year for which figures appear to available) California's total greenhouse gas emissions were 430 million metric tons CO2 ...
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2answers
91 views

Why are $\small\sf{CH_4}$ and $\small\sf{CO_2}$ levels coupled during the Pleistocene?

CH4 and CO2 levels show correlation throughout the Pleistocene: Source: trustyetverify.wordpress.com What are the reasons of this coupling?
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2answers
207 views

How much heat was released from the 2019-2020 Australian bush fires?

How much heat was released from the 2019-2020 Australian bush fires? And is that likely to have a measurable impact on global atmospheric heat content? Maybe as a secondary question: How much impact ...
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7answers
16k views

Does organic decay release the same CO2 as burning?

Does a fallen tree left to decay release essentially all of its stored carbon as $\small\mathsf{CO_2}$ to the atmosphere? Or is the carbon uptaken by termites and bacteria, preventing its release to ...
6
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2answers
341 views

What causes the counter-intuitive presence of CO2 in the atmosphere during spring and summer months?

Recently, I stumbled upon this NASA map of the Earth from the OCO-2, a satellite that measures CO2 density in the atmosphere. http://www.climatecentral.org/news/nasa-tools-co2-19681 Specifically, I'm ...
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3answers
291 views

Are Ice Ages Affected by the Freezing Out of CO2 in Antarctica?

The freezing point of carbon dioxide is -78.5 $\small\mathsf{^o}$C. Occasionally this low is exceeded in Antarctica, and small quantities of CO2 are frozen out, but are returned soon after to the ...
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5answers
192 views

Why is smoke considered a factor of global cooling when analyzing nuclear winter scenarios, but arent when analyzing global warming scenarios?

In many articles on the internet (I'll cite a couple for the sake of the question), smoke from the fires (composed mainly of $\small\mathsf{CO_2}$ and CO) following a nuclear war would cool the ...
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0answers
36 views

Natural air-CO2 deviations in the troposphere

I'm working on a room air quality management algorithm, and many sensors seem to respond with $\small\mathsf{CO_2}$ measurements of as little as 200 ppm. Obviously a sensor giving off this value will ...
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0answers
33 views

Which Farm Crops Are Most Efficient at Reducing Local CO2?

The presence of nearby rainforest is known to measurably deplete the local atmospheric $\small\mathsf{CO_2}$ content, but how much would $\small\mathsf{CO_2}$-hungry crops reduce local $\small\mathsf{...
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1answer
79 views

In the 800 kyr $\ce{CO_2}$ record, how detectable would a short-term peak be?

It is stated in https://cdiac.ess-dive.lbl.gov/trends/co2/ice_core_co2.html that the temporal uncertainty for the glacier $\small\mathsf{CO_2}$ records is less than $\small\mathsf{5~\%}$ at any given ...
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0answers
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CO2 behaviour in atmosphere

I have a doubts about how $\small\mathsf{CO_2}$ absorbs an re-emits infra red (IR) radiation. Let's imagine an only-$\small\mathsf{CO_2}$ atmosphere. In this case, a large amount of 15 $\small\mathsf{...
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0answers
152 views

About climate sensitivity of carbon dioxide: today compared with PETM

Due to IPCC the climate sensitivity of CO₂ very likely is 3.0 ± 1.5 ℃ for each doubling of the concentration of atmospheric CO₂. Counting on earlier global warming using the Arrhenius formula [ΔT=λ·...
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1answer
6k views

What is the CO2 concentration by altitude and why?

Here is a measurement of CO2 concentration by altitude measured by aircraft:(from Pulsed airborne lidar measurements of atmospheric CO2 column absorption) Is this the usual vertical structure of CO2? ...
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2answers
190 views

Trends in atmospheric CO2

I plotted the atmospheric CO2-concentrations to see trends and wondered especially about the phase around 1600 in the plot which I find very interesting. Etienne Godin already told me some facts in ...
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2answers
13k views

CO2 emissions per calorie (food)

I have seen several lists with CO2 emissions by weight for producing several different food products. I think this is an interesting consideration, and possible argument for vegetarianism/veganism. I ...