Just two months before international climate talks begin in paris, a new report from energy and environmental groups predicts greenhouse gases can plunge 77 percent in 2050 by electrifying more than half the nation's cars, trucks and forklifts.

what text structure is used in the excerpt?

how much can electric cars impact climate change?

cause-and-effect
comparison-and-contrast
chronological
sequential

cause-and-effect

Explanation:

Cause and effect is a relationship of events or things, one of which is the result of the other or others. It is a blend of action and reaction.

Simply put, when something happens, it will cause something else to happen. The cause, in other words, causes the result.

In this context, if cars can be electrified, then the greenhouse gases will decrease.

Relationships of cause and effect are often used in the text of information.

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."