While the High Line project won't give Manhattan back its lost biodiversity, it is greening the city. Now bees will again find flowers to pollinate. Study the vocabulary of greening an industrial city.
Our correspondent Julian Earwaker visited America's 50th state, Hawaii. Here, he shares a few of his many impressions of the islands' beaches, mountains, volcanoes and waterfalls. Click through to get a preview of his fascinating story.