I gave up reading anything from Kant a year or so ago because he never has anything useful, interesting, puzzling to say. He's just one long stream of childish abuse and insult. It's important not to assume that CO2 cannot be a problem just because those promoting Climate Doomsterism seem to be almost uniformly dishonest, ignorant, unscientific, self-dealing, plain wrong, willfully obtuse, abusive, denigrating, insulting, demeaning, murderous, etc.
A weather eye on CO2 is wise - if CO2 gets to 500 ppm or even 1000 ppm, maybe it could be consequential in an overall harmful way.
Over the 21st century, some results might start to show. My guess is that about 10 seriously vast things will happen by 2100 and the 20th century woes about CO2 will be reviewed as akin to burning witches at the stake to solve some witchcraft problem. Peak People in 2037 will be a major transition. An influenza epidemic with 50% mortality [H5N1 mortality was 70%] would put a page in the history books. A Pacific Ocean bolide and vast tsunami would make CO2 sea level rises look like waves from a pebble in a pond. Reglaciation in 2020 due to cyclic vegetative cover of oceans and land will put the kibosh on worries about heating. Even a Little Ice Age would cause some geopolitical paradigm shifts. A minor nuclear war, or major one, which is what the 10s of thousands of atomic bombs are for, could easily make WWI and WWII footnotes in history. The fiat currency/democratic bludger catastrophes are still unfolding and could yet lead to economic collapse and insurrection and carnage in overpopulated places. Malthusian possibilities remain awesome with 7 billion people now seething on the planet [up from only 1 billion when Malthus was worried in 1800]. en.wikipedia.org How many people have ever lived: prb.org
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