From Alan Trusler, South Ockendon, Essex, UK
You report findings on the melting Greenland ice cap (21 September, p 10). Many amateur scientists and school pupils have witnessed this. In the mid-1970s, I worked on remote sensing in science education.
But the closure of Dundee Satellite Receiving Station due to the withdrawal of funding has left us without data from polar-orbiting weather satellites. The other UK-funded satellite receiving station at Plymouth doesn't offer such data.
