It’s probably good to start with the scientific consensus. Ninety-seven percent or more of peer-reviewed and actively publishing climate scientist agree that climate change that has occurred over the past hundred years is likely attributable to human activities. You can find information to support almost any claim out there but the overwhelming majority of reputable scientists working in this field are in agreement that climate change is very real. One important indicator scientists point to is the accumulation of heat in our oceans. While temperatures on land fluctuate in response to natural forces (such as volcanic eruptions), ocean temperatures are far slower to respond to such factors. This is very useful because it allows us to separate human caused climate change from other possible factors affecting climate. Ocean temperatures have been rising by over .1 of a degree each decade for the past fifty years. These changes have not fluctuated or deviated from a steady increase. This is just one piece of evidence among many, but it’s compelling because the world’s oceans are naturally resistant to short-term, temporary fluctuations.

Added: Jan. 5, 2018, 11:25 p.m. Last change: Jan. 5, 2018, 11:25 p.m.
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Ocean temperatures. Pre WW2 measured by collecting a bucket of water and inserting a thermometer read by a seaman. Post WW2 from engine intakes. All surface level. Since 1999 ARGO buoys. Amazing - see here https://celebrating200years.noaa.gov/magazine/argo/welcome.html. But they float freely and measure to 2,000 meters. Almost nothing is known about deep ocean temperatures. So coverage is very sparse and the timescales far too short to make any meaningful conclusions.
Keith Ougden 6 years, 3 months ago
Consensus isn't proof. Ask Galileo. The 97% consensus figure comes from this paper http://iopscience.iop.org/article/10.1088/1748-9326/8/2/024024/pdf. Read the abstract. In essence - 11,944 scientific papers were reviewed for mentions of "climate change". 66.4% had no mention. They were excluded. The 97% comes from an even smaller subset of the remainder. And everything is completely subjective.
Keith Ougden 6 years, 3 months ago