This is not a hypothetical! Just the existence of 8 billion humans their human environments may indeed warm up the atmosphere and this is not related to Climate Change!
There are about 8 billion humans roaming this planet! Each one has a relatively permanent body temperature of about 37 degrees Celsius. So to speak, each human being is a mobile heater!
There is no doubt that the spread of urbanization as a consequence of population growth and the agglomeration tendency has a warming effect on the atmosphere. The question is how much? E.g. the infamous urban heat island effect on land surface air temperature measurements is well known.
Add to that, the solar activity and cycles, the absolut main influence on earth's climate, is anything but constant and little is known its periodic changes!
In conclusion: Global Warming is a hoax and Climate Change is a religion as far as the speculation about the effects of CO2 on Climate is concerned!
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