How do we know that the pronounced global warming trend during the 20th and 21st century is not caused by natural cycles?
The National Academy of Science (NAS) presents a short video to explain why there is a greater than 90% chance that the global warming trend over the past 50 to 60 years is due to the burning of fossil fuels and other greenhouse gas emissions and not natural cycles.
Video courtesy of the National Research Council and YouTube.....
The recent slowdown in global warming actually makes sense when you factor in some man-made pollution and short-term natural variation.
A look global temperatures during EL Nino and the positive phase of the Pacific Decadal oscillation over the past 60 years.
More record high monthly and seasonal temperatures getting toppled this year.
It appears that this year's Arctic sea ice minimum extent will end up as the fourth lowest on record.
The summer of 2015 in the northern Hemisphere was the warmest on record, according to NASA GISS.
How will 2015 rank in terms of the annual Arctic sea ice minimum?