Education! Education! Education!
The more people realise that all these chemicals and sprays are not only killing and destroying our habitats and ecosystems but also have an impact on human health, the less people will buy them. Manufactures of these chemicals rely on people's ignorance. The more people know about the issue, the greater impact it will have on people looking for alternative methods.
I do wish Gardeners World on TV took a more pro-active focus on these BIG issues. Geoff Hamilton was also very clear on the benefits of going organic and everything he did revolved around an organic approach. Monty Don does mention organic methods rather sparingly.
In terms of green recycling schemes, perhaps we could all write to our local councils and ask them to only accept green waste from gardeners that use chemicals and pesticides that don't persist in the environment. At least I would be a start.