Guardian: 2010 is becoming the year of the heatwave, with record temperatures set in 17 countries. Record highs have occurred in Russia, Belarus and Ukraine – the three nations at the centre of the present eastern European heatwave which has continued for more than three weeks – but also many African, Middle Eastern and Latin American countries. Temperatures in Moscow, which have been consistently 20C above normal, today fell to a more manageable 31C (86F). But the extreme heat …