Polarization and politicization makes us dumb. Climate is complex and there should be periods of global warming and periods of global cooling. Big amplitude changes in periods of about 100,000 years and less big amplitudes irregular and capricious in between.
There is no doubt that increased atmospheric carbon dioxide has a greenhouse effect and that global cooling decrease the rate of atmospheric carbon dioxide. More CO2 makes it warmer and the warmer the more CO2 is released from the sees. And opposite, cooling decrease the rate of CO2 which makes it cooler. This amplifying feedback could explain a good deal of the short time irregularity of global temperatures.
As it seems we are heading for long time global warming since about 20,000 years or so. Historically the warming periods rather rapidly turn into cooling periods, both in short and long time perspective. What has happened in the last 150 years is that industrial emitted CO2 has reached really extreme levels on the top of the natural global warming, at the same time that the temperature anomalies is very high. And this is alarming.
Most of the energy of global warming is stored in the oceans and it is an enormous amount of extra energy that has ben stored between 1970 and 2003: 200,000,000,000,000,000,000,000 Joules. Which correspond to 40 billion atomic Hiroshima bombs (which is about 5 bombs per person of today earth population), or to 200 million ordinary thunderstorms, or to to 4,000 ordinary hurricane days.
Glacial melting is not only depending of human activities, it naturally suppresses the naturally occurred CO2 amplified feedback and should be expected to alter, but since 1970 the ice is rapidly melting all around the world.
If we are lucky, the industrial emissions is responsible for all this
warming and melting. The worse alternative is that the 3 million year
record of atmospheric carbon dioxide is going to act upon the top of
what is already alarmingly high.