CO2 emissions on track to push Earth beyond 1.5 degree threshold by 2028, report finds.

Humans are releasing so much greenhouse gas that within three years, planet Earth will likely be unable to avoid 1.5 degrees Celsius of long-term warming since pre-industrial times.  That’s the finding of a new study published in the Earth System Science Data journal on Wednesday.

That 1.5 degree goal, established by the 2015 Paris agreement, has been a cornerstone of international efforts to curb worsening climate change. Scientists…