We must not be the last generation to have the opportunity to marvel at nature.

When I was growing up, I took for granted the excitement of climbing trees in the local woods at the end of our road, sleeping under the stars at Scout camp, and exploring the micro-worlds of seaside rockpools on holiday in Cornwall. Our children and grandchildren deserve to be astounded by the magnificence of our landscapes and coastlines, mesmerised by the beauty of a robin’s song, and to splash about in the local river.

Nature is under threat. The Conservatives have left Britain one of the most nature-depleted countries in the world. Almost half of our bird species and a quarter of our mammal species are at risk of extinction. Precious landscapes in our national parks are in decline. And our rivers, lakes and seas are awash with record levels of toxic sewage.