We charge the companies for this service. It's completely free of charge for software developers.
This is Nick. A software developer who likes technology, and getting paid well for making software. Moreover, I always try to work at companies whose product is in line with my values in life.
For developers (job applicants) it is completely free. But companies need to pay something per month, say a few hundred euros per month. Pricing is negotiable, and I won't charge companies that can't afford this service.
I use the Draw Down project as a reference. Check it out: https://www.drawdown.org/solutions-summary-by-rank It is a list of solutions for reversing global warming gathered by a large team of experts.
Many things, but maybe mainly my love for fluffy animals? Just search the internet for the photos of endangered animals. By abusing the environment we are threatening their lives. Also this blog post titled "What can a technologist do about climate change?" was a nice kick. Read it here http://worrydream.com/ClimateChange/