The amount of carbon dixode in the atmosphere has now passed 400 parts per million for a whole day, as measured at the Mauna Loa Observatory in Hawaii. There hasn’t been this much CO2 in the air for 3 million years, before humans evolved. The level of CO2 fluctuates as plants absorb it and release oxygen, but the trend line indicates that we are generating the stuff so quickly, the plants aren’t going to keep up.
Nobody knows for certain what the effects will be, but the scientists who study climate change are deeply concerned: “It feels like an inevitable march toward disaster” and “the time to do something was yesterday”.
One of the idiots in Congress is quoted as saying we shouldn’t worry, since CO2 only makes up 0.04 percent of the atmosphere. Unfortunately, that’s not how chemistry works. Research shows that current levels of CO2 are very effective at trapping heat near the earth’s surface.