Read an excerpt from the nobel lecture by al gore: fifteen years ago, i made that case at the "earth summit" in rio de janeiro. ten years ago, i presented it in kyoto. this week, i will urge the delegates in bali to adopt a bold mandate for a treaty that establishes a universal global cap on emissions and uses the market in emissions trading to efficiently allocate resources to the most effective opportunities for speedy reductions. how does gore establish his credibility on the subject of global warming in this excerpt? a. he lists his personal involvement in climate change work. b. he shows the logic of his worldwide travels. c. he gives an emotional plea about worldwide deficiencies. d. he appeals to an international crowd.

A) He lists his personal involvement in climate change work.

Explanation: In the given excerpt from the Nobel Lecture by Al Gore, we can see that he describes his journey in the subject of climate change, he says that he spoke at the "Earth Summit" in Rio de Janeiro, then in Kyoto and then in Bali. From the given options, the one that represents how Gore establishes his credibility on the sobject of global warming is the correpsonding to option A: He lists his personal involvement in climate change work.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."