Numbers of birds in Britain decreasing

Hi my name's Sam, and I'm a student journalist from Kent writing an article about the declining numbers of birds in Britain over the last 40 years.

Just wondered if anyone had any thoughts on the fact that numbers of farmland birds have more than halved, and woodland birds are down by a quarter?

What do you think are the main reasons for these changes, and is there anything that can be done about it?

Would really appreciate your help! Be good to get the public's opinion on this!

Thanks x