The world faces a significant risk of passing a crucial global warming threshold earlier than scientists had suggested, possibly as soon as 2050, a paper published Monday found.
Even a few degrees across the entire globe means aWarming of 1.5 degrees Celsius would increase heat waves, lengthen warm seasons and shorten cold seasons. If temperatures were 2.0 degrees warmer, heat extremes would more often reach critical tolerance thresholds for agriculture and health, multiple analyses have found.
While globally average temperature numbers are small, they indicate much larger changes in extremes, said Gerald Meehl, a senior scientist at the National Center for Atmospheric Research who was part of the team that won the Nobel Prize in 2007 for its work on climate change. Already, with today's 1.1 Celsius warming, the chance for record heat is twice as likely as it is for record cold.
The nations of the world have agreed on the need to reduce emissions, though not how specifically. The, signed in 2015, set long-term goals to guide the world's nations to substantially reduce global greenhouse gas emissions to limit the planet's temperature increase.
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