Entomologists have seen a striking contraction of insect numbers and diversity. They are sharing new data suggesting that climate change is the culprit and they are coming up with a way to protect the survivors: a bioliteracy program that aims to educate Costa Rican residents about the diversity around them and empower them to conserve it. It's a model they hope catches on and spreads around the globe.

A group of 50 countries has pledged to protect at least 30 per cent of the world’s land and oceans by 2030 in a bid to tackle the world’s worsening biodiversity crisis. The commitment to restoring nature will be announced today at the One Planet Summit, a key meeting for world leaders hosted by France, the World Bank and the UN. The coalition of countries, led by the UK, Costa Rica and France, together account for around 28 per cent of the world’s land...

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