Scientists say that of the world's plants are in of dying out – of becoming extinct. Dr Paul Smith, from Botanic Gardens Conservation International, said one in of the world's plants is in danger of . The world's botanic gardens contain about 100,000 , including a third of all the world's endangered plants. Botanic gardens help to protect around 40 per cent of endangered species of plants. They contain many of the plants. Dr Smith said: "This is the time that we have carried out a global to look at the wide range of plants grown, managed and conserved in botanic gardens. For the first we know what we have and, perhaps more , what is missing from botanic gardens."
Researcher Dr Samuel Brockington said the world's botanic gardens were the hope for saving the world's most endangered plants. He said: "Currently, an one-fifth of plant is under threat, yet there is no technical why any plant species should become extinct." Dr Brockington warned that if we do not protect endangered plants, people could have trouble finding food and in the future. He said: "If we do not conserve our plant diversity, humanity will struggle to solve the challenges of food and fuel …and climate change." Most of the plants are in because of humans cutting down forests for farming and , and because of and climate change.