Climate change is happening. It's happened before and it'll happen when we're gone.

We do need to stop fossil fuels and switch to renewable energy, but I think a more pressing reason is that one day we'e going to run out of fossil fuels. No more gas. No more plastic (as least not from the current process. Maybe we make it from alcohol and it goes way, waaaay up in price but no more cheap plastic)

Millions of companies who rely on plastic will need to make fundamental changes or go out of business. Hundreds of million of jobs will be lost in an instant. 

Unless we start gradually implementing renewable energy asap.