I SEE that Trevor Farrer repeats his opinion about global warming - that is, he denies it (Letters, April 6, ‘Hooray - we are leaving’).

I’d like to refer him to the current edition (April) of the National Geographic magazine – surely the most prestigious general interest magazine devoted to scientific and cultural issues in the world.

The current edition cites ‘Climate Change – 7 things you need to know’.

These are: 1 The world is warming

2 It’s because of us

3 We’re sure

4 Ice is melting fast

5 Weather is getting intense

6 Wildlife is already hurting

7 We can do something about it

John Forder