Why is it so hot?
A heat dome that covered southern New England finally moved on yesterday. The highs touched 100°F, and with the humidity, the heat indices were five degrees higher. I have a feeling this won’t be the last of it. “The world’s oceans are the hottest on record for June, pushing past records set during the 2023–24 El Niño years. “Right now, the average sea surface temperature is just under 21°C across the world’s tropical and temperate oceans. Before widespread industrialisation in 1870, the temperature was about 19.6°C. “That may not sound like a big difference. But heating the world’s oceans this much requires a truly enormous amount of energy. Of all the extra heat trapped by greenhouse gases from burning coal, gas and oil, more than 90% has gone into the world’s oceans. “As a result, the oceans are getting rapidly warmer . In 2025, the heat added was the equivalent of about 12 Hiroshima-scale nucl...