A、The management of rubbish. B、The variety of species on earth. C、The possibilities of world war. D、The amount of fresh water. D

M: What did you do over the weekend?
W:(1)I went to a global warming rally in London. It was fantastic to be around so many people who care about the environment.
M: Do you think there’s anything we can do to reverse the damage that’s been done already?
W: It might not be possible to fix the problems that we’ve created for ourselves, but there are lots of things we can do to prevent more damages from happening.
M: Like what?
W: Well,(2)we can use public transport instead of taking our cars for a start.
M: What else can we do to protect the environment?
W: If you do have to drive, you should make sure that your car runs on safe petrol. Also, your home should use sources of renewable energy.
M: How about recycling? Does that actually help?
W: Yes. You should take your glass, paper, plastic, cardboard, and tin cans to a recycling center.
M: What do you think is the biggest worry for our future?
W:(3)I think that the issue of greatest concern is having enough sources of clean water for everyone.
M: I had no idea you were so concerned about the environment before!
W: To be honest, in order for the earth to continue to be a habitable place, we’re all going to have to become more interested in the environment.