Imagine that a person's individual carbon emissions were logged and accounted for in a ledger over an entire lifetime. If that person could perform certain actions to subtract from their carbon emissions in this ledger, what might these actions be? Via such actions, would it be possible to end up with a carbon negative final total at death, assuming that person continues to indulge in all the activities that currently contribute to global climate change (e.g. eating red meat, using fossil fuels)?
For example, is there a rough number of trees that would need to be planted to 'pay' for these emissions in the ledger over an entire lifetime, and then some (assuming average life expectancy of person living in 1st world country)?
Edit: I understand such a question is necessarily vague due to the sheer number of variables at play. As such, I wouldn't be looking at exact numbers, rather some kind of scale. That is, I would be interested to hear whether something needs to be done hundred's, thousands, or tens of thousands of times, etc. In regards to the individual, let's assume a 'typical' person who lives in Australia (from the Census) and is "married and lives in a couple family with two children" and "lives in a house with three bedrooms and two motor vehicles". Feel free to make any other assumptions, and if possible, skew to the worst-case/heavy use scenario - for example, motor car and/or heating/cooling is used every day, eats red meat every meal, etc.