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reality public information on hazards and risks is a perfectly normal moral obligation, hardly a transgression of the “correct” role for a researcher. But scientists are sometimes criticized for pointing out factually broad impacts revealed by research output. This is a puzzling outcome, akin perhaps to an engineer arranging a safety belt for vehicle occupants but not being allowed to say what safety belts do or how to use them. Given that the warming is caused by greenhouse gases, how do we know that human CO2emissions are specifically to blame for their sudden increase? This too can be quantified. Another example, predicted byArrhenius in 1896, states that winters should warm more than summers. Hemispheres receive less sunlight in winter and cool down by radiating energy away into space. If greenhouse gases were increased, they would act to prevent some of that energy from radiating away, thus warming the winter hemisphere. The warming effect on winter was predicted to be greater than that of summer. Again, this is observed. Greenhouse gases like CO2are understood quite well, so we can make predictions about what we should observe. When CO2is added to the atmosphere, it causes the lower atmosphere to warm. This warming occurs because the added CO2traps infrared heat emitted from the Earth’s warm surface – heat that would otherwise escape to space. However, in the stratosphere, above the troposphere, adding CO2to the atmosphere causes it to cool. remember the days veteran home of the free all over printed hawaiian shirt. This is because the extra CO2in the stratosphere radiates more heat to space. The stratosphere has been cooling in recent decades, as atmospheric CO2increases. This also rules out the sun, as an increase in solar energy would heat the whole atmosphere. Understanding and Responding to Climate Misinformation, combining climate science and communication best practices to debunk common climate myths.
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