- Climate change is one of the defining issues of our time.
- It is now more certain than ever, based on many lines of evidence, that humans are changing Earth’s climate.
- The atmosphere and oceans have warmed, accompanied by sea-level rise, a strong decline in Arctic sea ice, and other climate-related changes.
- Is the climate warming?
- How do scientists know that recent climate change is largely caused by human activities?
- Yes. Earth’s average surface air temperature has increased by about 0.8 °C since 1900, with much of this increase taking place since the mid-1970s.
- Scientists know that recent climate change is largely caused by human activities from an understanding of basic physics, comparing observations with models, and fingerprinting the detailed patterns of climate change caused by different human and natural influences.
- The expected changes in climate are based on our understanding of how greenhouse gases trap heat.
- Since the mid-1800s, scientists have known that CO2 is one of the main greenhouse gases of importance to Earth’s energy balance.
- Both this fundamental understanding of the physics of greenhouse gases and fingerprint studies show that natural causes alone
- The less you know, there more sure you can be that you are right. The evidence is clear.
The central concept of the science propagated by the RS and NA is:
- More CO2 will cause the Earth to warm by trapping (absorbing) more of the heat (infrared radiation) emitted from Earth's surface.
- I can calculate the motion of heavenly bodies, but not the madness of people.
Truth is ever to be found in simplicity, and not in the multiplicity and confusion of things.



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