20,000 BC – much of the Earth was still covered by the glaciers of the last ice age. Temperatures were cooler than today – around 5 Celsius degrees on average.
Credit: xkcd
More wisdom at https://xkcd.com/ / climate change climate change evidence climate change global warming carbon dioxide CO2 greenhouse gas industrial revolution glacier proof evidence human cause empirical evidence element climate change global problem absolute consensus human action leading increase average temperatures try to argue with that but you can't global warming warming depends how you measure Richard Feynman scientist believes empirical evidence quoting consensus graph draw a slightly straighter trend line on there misunderstanding misrepresentation NASA conspiracy Tony Jones interpretation highly qualified scientist I don't believe that data has been corrupted manipulated NASA audience began to laugh Steve Goddard 1930s were warmer recent decades Bureau of Meteorology Greg Hunt squashed investigation BoM Bureau of Metrology moon landing NASA Australian Academy of Science adversarial report is superb accusation NASA Australian Bureau of Meteorology Met Office UK collaborating manipulate global temperature data model answer question making projections based on models providing models validated proven accurate models have already been proven inaccurate IPCC Intergovernmental Panel on Climate Change empirical data that's flat out wrong deception flat out incorrect snapshot evidence 2015 global upper ocean heat content highest record 2015 global sea level highest on record in 2015 70mm higher than that observed in 1993 global surface temperature highest on record El Nino 10-40 per cent contribution tropical cyclones well above average overall key point is if you don't accept that the only way to try to formulate policy what we do with emissions build models predict the future tarot cards tea leaves anthropogenic climate change /
