How does the idiom "think globally, act locally" continue to be useful for present-day environmentalism?                 a.  it's used to explain that the environment is an inherently global and large-scale concept.      b.  it's used to create grassroots support for oil spills, dirty water, and polluted air.      c.  the lack of government solutions for global warming has made groups focus on local issues.      d.  environmentalist groups use the idiom to mirror the efforts of antiwar movements.

C

Explanation:

Global warming affects the world as a whole, per se, it affects the whole globe. By having people focus on affecting their local environment positively, then little by little, the global warming will decrease. It will only decrease if we all do our part in our local community.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

fears about being blown up