Dr Watson from Bristol University said we should be wary of interfering with nature on a planetary scale - known as geoengineering. It involves changing our planet to counteract effects of climate change. Earth is shown here pictured from space
The Hubble Space Telescope has detected a tiny, dark moon circling the dwarf planet on the frozen fringes of our solar system. Scientists announced the discovery by some members of the team that spotted Pluto's smaller moons years ago.