My greenhouse is covered with a thin plastic film. A few molecules of plastic are all it takes to make it 30 Fahrenheit degrees warmer inside than out. When coal, gasoline, and natural gas are burned, they produce carbon dioxide which traps heat just like the plastic film of my greenhouse.
Green plants recycle carbon dioxide, but they can’t keep up with the amount that we put out. Two hundred years ago, atmospheric CO2 levels were 280 parts-per-million; now they’re over 395 ppm. Every year globally, we burn 9 billion tons of fossil fuels. None of this is disputed.
The debate is about whether or not there are any consequences. Six years ago, the consensus among climate scientists was that man was accelerating climate-change by burning fossil-fuels.
The earth’s climate has always changed but never as fast as now. The change we are experiencing, is a response to the coal and oil we burned 50 to 100 years ago. Our average temperature has risen 1.4 Fahrenheit degrees since the pre-industrial age. Sea-levels are rising due to thermal expansion.
The scientific consensus is that a rise of 3.5 Fahrenheit degrees would be bad but survivable. Even if we stopped burning carbon today, scientists now forecast that we would blow past this mark just from what we’ve done over the last 50 years.