This. Less flying, less buying, less meet, less consumerism, more local & seasonal food. No need to go full 100%: it would be enough if critical mass reaches a good-enough level.
This year has been the perfect experiment: Through massive, massive, restrictions in our normal life we managed to reduce CO2 emissions by what, 30%? Say we could do it even better if everyone became vegan and only rode bicycles and we reduce them by 70%. Awesome. That about triples the time we have until we need to reach net zero emissions. It probably also crashes the economy that's supposed to pay for the modernization and replacement of our whole energy infrastructure.
most likely 4-6% by the end of the year is europe goes back to the same lockdown as in march.
To reduce that to needed levels by 2050 (to reach the 2°C by 2100 "best" scenario), you need -5% every year since last year. Its in the bag for 2020 at least, so that's great.