Lots of things are finite. What's your point?
Just because someone called a scientist (or scientists) guess at the cause of global warming doesn't mean it's science.
1. Observe
2. Develop an hypothesis why
3. Create an experiment to prove or disprove the hypothesis.
They've observed and they have an hypothesis. Because they've failed with Step 3, they're reverted to scare tactics.
100s of years ago 'a consensus of scientists' thought the earth was flat and they sought to silence anyone who disagreed with them. The same thing is happening today, e.g., Dr. (scientist) Heidi Cullen of the WeatherChannel suggesting that any weather person who disagrees should have their AMS certification revoked. When you can not prove (Step 3), silence those who disagree.