Source: Know More
From meteorologist Paul Douglas:
According to scientists at NOAA and NASA May was the warmest on record, worldwide. It was the 351st month in a row of global temperatures warmer than the 20th century average.
Measurements of global temperatures are consistently rising, especially over the last half century. As the World Meteorological Organization points out: “13 of the 14 warmest years on record have all occurred in the 21st century.”