Of course there has been 'climate change' and 'global warming' before, caused by things like large volcanic eruptions (deccan traps) or meteorites. But they have pretty universally coincided with mass extinctions. And when we say glabal warming is anthropogenic, we mean this time humans are causing the warming by emitting a lot of co2 (and methane and no2 etc). It is fairly unequivocal at this point. This time its entirely within our power to prevent another mass extinction, because this this time we are causing it. Why wouldnt we try?
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