Identifying Logical Fallacies in Environmental Debate

In a recent debate on environmental policy, a politician argued, "If we do not immediately ban all fossil fuel use, then our planet will be uninhabitable in a decade! Clearly, we must act now to save our future." This assertion points to a drastic conclusion without considering a middle ground or addressing potential counterarguments. Critics argue that such extreme positions may prevent rational discussion about feasible alternatives and may lead to ineffective or harmful policies.

Based on this excerpt, which logical fallacy is primarily illustrated by the politician's argument?