Every year on June 5, World Environment Day is observed across the globe with an aim to reinforce and sustain the awareness around environmental action. The Day is celebrated with a unique theme each year which is announced by UN Environment Program (UNEP) and this year's theme is 'Ecosystem Restoration'. This year, UNEP is taking a step forward to ensure action with the launch of the UN Decade on Ecosystem Restoration (2021-2030). Here are some important facts about the environment, you need to know.