science

If you have a lot of time and enough conviction:

Lobbying, petitions, run a non-profit organization to do so.

It takes a lot of time and it's frustrating, but look at what individuals like Louis Rossmann and Ross Scott have been able to pull off with Right to Repair and the Stop Killing Games Movement.

If you don't have as much time:

Donate some time to projects to help out. For example, take a look at some of the projects listed underneath "Climate" category on Zooniverse: https://www.zooniverse.org/projects?discipline=climate

Here's a description of the project, "ClimateViz":

Extract information from various climate scientific graphics to combat misinformation and support scientific communication