Choose the correct response.

1 A: They say that cars increase C02 emissions. ...
B: a I'm crazy about it.
b That's just so true.

2 A: I read somewhere that they are cutting down the forest to build a new road. ...
B: a That's shocking.
b I don't fancy it.

3 A: Did you know that more than 150 acres of rainforest are lost every minute? ...
B: a Do something before it's too late!
b That is terrible.

4 A: I heard the other day that cutting down trees improves the quality of our modern lifestyles. ...
B: a I'm really into it.
b That's just ridiculous.