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like artificial fertilisers. the project will take months to complete. ah, so here we are. at thejohn innes centre in norwich, they're also shining a light on the past. i wanted to show you these old herbarium sheets. their samples go back 100 years and they're looking to cross—breed these older plants with today's varieties. and what we want to do is look for new and useful genetic variation. so disease resistance, stress resistance, increased yield. they've already started some field trials. it's essential to find solutions. climate change and the extreme weather it brings is reducing the amount we can grow globally. and pests and diseases are a big problem, too. 0ne fifth of the projected yield is lost to them each year. there's a very