Global warming is a complex issue, with many factors and no easy answer. Because of this complexity it makes it easy for someone to just not believe it is true, because the complexity it too much for any one person to handle. It is more complex than switching to solar panels, and electric cars, and stopping cows from having gas.
Fixing these issues requires changing culture, which is hard, and will create a lot of people resistant to changes, they will hire a lot of people to make their point across, to convince others.
We have a lot of science, and we need more... However I think one thing is needed isn't finding a silver bullet, is to counter the destructive marketing with more counter marketing. Many of the colleges and universities who are doing a lot of science on the topic, also have business schools and programs. Get a handful of those MBA and Public relation majors onto your grant, to help spread the information to help change the culture.
I have seen major cultural changes happen due to effective marketing. From 2004 - 2015 where there was talk to make a constitutional amendment to ban Gay marriages, to it being legal in all states. The rise of smart phones and mobile connectivity...
Marking isn't always bad and trying to sell you products, it is also used to explain ideas. They are actually a lot of MBA students who are not about being money grubbing capitalists, but are about trying to make the world better. (MBA with considerations in not-for-profit is a popular track). These grant for science, should also be allocated to students who are trained to sell the ideas to the general population.
Showing a graph doesn't have impact on those who don't know how to read graphs.