now, it's all very well having tasty stuff to eat but in terms of the climate, how our food is produced is key. and our very ownjen copestake is in a greenhouse for us. jen. yes, i'm here in the norwich greenhouse and it looks completely different than it did on my last visit. it's absolutely filled with plants now. there are 378,000 tomato plants here, and that represents 5% of the uk's consumption of tomatoes. last year, we saw this world—first project being built using an environmentally friendly heating system. a typical greenhouse would burn fossil fuels to create the heat that you need to go through these rails. but our greenhouse takes waste heat from sewage treatment works. we use that heat instead of burning fossil fuels. the hard hats and hi—vis gear we wore last time have been replaced by coveralls to protect the crops from bringing in external