Global warming: it increases heat-trapping in Earth’s atmosphere and causes ice to melt and sea level will rise.Fresh water : about 1.1 billion people worldwide lack access to water.Tourism : it affects the security of many countries and threatens the life of safe peopleC-A: Have you been to Stratford-upon-Avon?B: Yes, I have.A: When were you there?B: I was there last summer.A: Did you see Shakespeare’s house?B: Yes, I did.A: Have you been to a traditional British restaurant?B: Yes, I have.A: When were you there?B: I was there last weekend.A: Did you eat fish and chips?B: Yes, I did.A: Have you been to a cricket field?B: Yes, I have.A: When were you there?B: I was there Friday.A: Did you watch a game of cricket?B: Yes, I did.