Hot weather lowers exam . A major from three universities in the USA says may reduce learning in the and long term. Hot on test days, and higher than yearly temperatures lowered . Researchers looked at the weather affected test scores from 10 million American students. Findings showed that a rise of just 0.55ºC over one year led to a one per cent decrease in .
The paper is called "Heat and Learning". It was published last month. A worrying in the study is that global warming may affect the future of students around the world. Researchers said that if temperatures continued to rise, the American could lose $25,000 because of lower test scores. Air in classrooms could stop . Hotter weather was " damaging" for students.