To add some numbers to this, according to http://www.climatefinancelandscape.org/ $392 billion was spent on various aspects of tackling climate change in 2014. In contrast, under $10 million per year is being spent on potential risks from AI (https://80000hours.org/problem-profiles/artificial-intellige...).

That doesn't mean there's nothing neglected in climate change (e.g. negative emissions technology) and it would be good to see some more investigation into this.