Carbon Dioxide in the atmosphere is not the reason for past slight temperature rises.
There is no scary danger around the corner which needs us to bring our carbon footprint to zero.
This is a HOAX to (among other things) ultimately help bring on the first GLOBAL 'carbon' TAX, paid to the 'world bank'... in the name of environmental saftey.
I'd make that my answer.
Also let him/her know about the 30,000k+ scientists/PHDs signed a petition deeming it a fraud.
Unless this has nothing to do with global warming.
Don't forget 5% of that stuff you just exhaled while reading this is Carbon Dioxide.