Look at it this way. A large swath of people believe it is a problem and most of them are willing to put time and money in counteracting it. We have leaders like Elon Musk already creating a great response. We can't winnow out of it alone but we already have leaders & a large group of people interested in fixing it.

The answer to "what now" is start a company that is in the business of carbon sequestration or climate affect mitigation and become a leader. It's obvious!