We don't all want to change the world. But sensible, caring people don't want to ruin the world. Sensible, caring people want to cause as little harm as possible.
If you have a goal to reduce the amount of harm you cause, go vegan NOW.
Given:
a) the current climate change crisis
b) the health risks to humans posed by intensive animal agriculture
c) the inherent cruelty involved in animal agriculture
d) our higher, more developed morality
e) our ability to choose veganism and remain healthy
all add up to one conclusion: