I've planted enough trees to absorb all the CO2 emissions created by me during my lifespan, which means I can breath easily. I hope...
Seriously speaking, Earth's climate has always been in constant change. Whether human activities affect it and by how much can be debated till the end of the world but the truth is we'll never know for sure. I think we should do everything we reasonably can to control emissions, without going to extremes with the finger-pointing etc.