I learned that human activities produce gases that deplete the ozone layer, and create the greenhouse layer, which increases the world's temperature. (And seems real , now in Thailand it's 35 degree Celsius)
Now. I want to know that if there isn't any human activities that causes changes to atmosphere , Which statement is correct?
The earth will be cool. As the same temperature as before the industries age. It's only human's fault that makes the world hotter.
The earth will be gradually hotter. In the past there are "ice age". And Now there might just be "hot age". Humans activities are just make the process faster.
Can we point out which statement is currently correct? If not , you can add your own statement and if you are able to explain , do it.