There is an argument that CO2 levels follow a rise in temperatures. I'll leave that as an exercise for the reader because we're getting away from my contention that scientific opinion is not something that you can put to a vote.
This is alarmist claptrap. If the world were that unstable it would have fried a long time ago. There are other explanations for the recent perceived increase.
Due to man or not there is absolutely nothing we can do that will change anything. The earth's weather is determined by forces far more powerful than anything we do. The climate will stabilise at a new status and we must adapt to it.
You can call it what you like, all I'm saying is that you cannot take a vote on this kind of matter. The consensus has been wrong many, many times before.
Expenses are important, you shouldn't ignore them. Claiming part of your home for your business gives rise to all sorts of problems over Capital Gains and other things.