Read the excerpt from Greta Thunberg’s speech at the United Nations Climate Action Summit.

So a 50% risk is simply not acceptable to us—we who have to live with the consequences.

To have a 67% chance of staying below a 1.5 degrees global temperature rise—the best odds given by the [Intergovernmental Panel on Climate Change]—the world had 420 gigatons of CO2 left to emit back on January 1, 2018. Today that figure is already down to less than 350 gigatons.

How dare you pretend that this can be solved with just "business as usual” and some technical solutions? With today’s emissions levels, that remaining CO2 budget will be entirely gone within less than 8 1/2 years.

How does the underlined rhetorical question support the claim that current efforts to reduce CO2 emissions are ineffective?

by presenting a solution to the problems of not addressing CO2 emissions sooner
by emphasizing that the audience is not trying hard enough to reduce CO2 emissions
by highlighting the pattern in global temperature rises that cause CO2 emissions to increase
by focusing on methods that would be most effective at immediately reducing CO2 emissions