This post is by James Wang, Ph.D., a climate scientist at Environmental Defense.
A study by Weaver et al., published this month in the journal Geophysical Research Letters, reports that "All emission targets considered with less than 60% global reduction by 2050 break the 2.0°C threshold warming this century…." (They mean 2.0°C above the pre-industrial temperature, equivalent to 2.3°F above today’s temperature. For more on threshold temperatures, see “How Warm is Too Warm?“) Even more disturbing, they say, "Even when emissions are stabilized at 90% below present levels at 2050, this threshold is eventually broken."
That makes all our efforts seem hopeless. But are they right? In a word, no. Here’s why.