Agriculture as we know it would be more or less impossible if the average temperature was −18 °C.In other words, it would be freezing cold even at the height of summer.
So how can we tell what effect CO2 is having on temperatures, and if the increase in atmospheric CO2 is really making the planet warmer?
One way of measuring the effect of CO2 is by using satellites to compare how much energy is arriving from the sun, and how much is leaving the Earth.
That information gives us the next piece of evidence; CO2 has increased by nearly 43% in the last 150 years.
The final piece of evidence is ‘the smoking gun’, the proof that CO2 is causing the increases in temperature.
Humans, plants and animals can’t tolerate the extremes of temperature on Earth unless they evolve special ways to deal with the heat or the cold.
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Nearly all life on Earth lives in areas that are more hospitable, where temperatures are far less extreme.The reason that the Earth is warm enough to sustain life is because of greenhouse gases in the atmosphere.These gases act like a blanket, keeping the Earth warm by preventing some of the sun’s energy being re-radiated into space.According to the WMO, the hottest was 56.7°C (134°F), measured on 10 July 1913 at Greenland Ranch (Death Valley).Man could not survive in the temperatures on the moon, even if there was air to breathe.Yet the Earth and the moon are virtually the same distance from the sun, so why do we experience much less heat and cold than the moon? The moon doesn’t have one, so it is exposed to the full strength of energy coming from the sun.At night, temperatures plunge because there is no atmosphere to keep the heat in, as there is on Earth.This is the first piece of evidence: more energy is remaining in the atmosphere. They ‘capture’ energy, and then emit it in random directions.The primary greenhouse gases – carbon dioxide (CO2), methane (CH4), water vapour, nitrous oxide and ozone – comprise around 1% of the air.All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. There's no empirical evidence "There is no actual evidence that carbon dioxide emissions are causing global warming.Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. Note that computer models are just concatenations of calculations you could do on a hand-held calculator, so they are theoretical and cannot be part of any evidence." (David Evans)The proof that man-made CO2 is causing global warming is like the chain of evidence in a court case.