Average life expectancy based on age and comorbidities of the people who die is around 10-13 years. That is not an insignificant lifetime reduction.
0.5%-2% of the people who get it, die. That is much worse than the flu that kills 0.04-0.1% of the infected. The flu itself is already pretty deadly and this is much deadlier.
But it's not deadly enough to reverse the climate change. Humans are smart animals: they will adopt to the virus real quick, restart the dirty economy machine, get their previous life expectancy back and suffocate in dirty air, water and unbearable weather. But they will die on their terms, with pride and dignity.
0.5%-2% of the people who get it, die. That is much worse than the flu that kills 0.04-0.1% of the infected. The flu itself is already pretty deadly and this is much deadlier.