Hundreds of millions of people worldwide will be affected by melting snow covers, ice and glaciers, according to a new United Nations report released ahead of tomorrow's celebrations for World Environment Day. The availability of water supplies for both drinking and agriculture will also be impacted, while rising sea levels will affect low-lying coastal areas and islands, said the report, Global Outlook for Ice and Snow, compiled by the UN Environment Programme (UNEP) and a network of about 70 world experts, and launched today in Tromso, Norway.