Question

1. what reason does greta thunberg give for her claim that a low - carbon economy isnt going to work?

because it doesnt lead to anything
because our emissions have to stop, if we are to have a chance to stay below the 1.5 - degree target
because the u.s.a. is leaving the paris accord and that seems to outrage and worry everyone
because planting trees is good, of course, but its nowhere near enough of what is needed

Explanation:

Greta Thunberg's stance on climate action emphasizes the need to stop emissions to meet the 1.5 - degree target. A low - carbon economy, in her view, might not be sufficient as it doesn't address the need for emissions to stop. The option "because our emissions have to stop, if we are to have a chance to stay below the 1.5 - degree target" aligns with her reasoning about the urgency of emission reduction for climate goals, while the other options either are not related to the core reason about the inadequacy of a low - carbon economy or are about other aspects (like the US leaving Paris accord, tree - planting being insufficient, or a vague "doesn't lead to anything").

Answer:

B. because our emissions have to stop, if we are to have a chance to stay below the 1.5 - degree target