Actually there is a lot of "reasonable action" implied there. We should begin to apply some easily accomplished technologies that reduce all sorts of greenhouse gases and see what actually happens. The Thunberg girl was quite correct in that, while everyone seems to agree about the impacts, and most advanced nations have pledged to begin (by agreements ), noone is rally moving on to do really anything, and we, a world leader in the past, have taken ome mean ass steps backward.
Do something and see what happens is what Id like to see.
Using the economic benefit "based on uncontrolled pollutants" argument is kinda silly to begin with. Since most of us agree that we cant fully quantitate the effects our species has had, to do NOTHING, will , in itself, probably destroy any future economic capacity. We see the severe declins of C3 plants (most all useable plants are C3's).
That, and several other climate driven effects ,Probalistically, predict some dire consequences that we do not know whether we can remediate from.
To just sit and argue about a given , is about as unintelligent an approach we can carry out. Its about our entire species has begun a terminal game of "Climate Russian Roulette"