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La Niña conditions are currently forming in the Pacific Ocean, however forecasters expect that if these conditions persist through the winter, this will only be a mild episode, compared to La Niña that have occurred in the past.

La Niña, Spanish for "little girl", occurs when sea surface temperatures drop to below normal along a band following the equator in the Eastern Pacific, the counterpart to the phenomenon of above-average sea surface temperatures known as El Niño. These two phenomena are part of the El Niño-Southern Oscillation (ENSO), one of the strongest drivers of climate variation in North America and around the world.
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The infamous hole in Earth’s ozone layer has shrunk down to 7.6 million square miles wide (12,200,000 square kilometers), the smallest the gap has been since 1988. This healing of Earth’s main shield against ultraviolet radiation is due largely to efforts initiated in the mid-1980s, when the use of ozone-harming CFCs was phased out. Not only is this positive news in regards to our atmosphere’s ability to filter out harmful UV radiation, it also stands as an example of how humanity can make a positive, large-scale impact when efforts to reduce ecological harm are required, such as in the case of our need to reduce greenhouse gas emissions.
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The Central American country of Nicaragua and war-torn Syria have joined the rest of the world’s nations in agreeing to sign onto the Paris climate accord, as the world’s nations meet in Bohn, Germany, for the world’s largest climate summit. These two new inclusions to the accord leave the United States as the sole hold-out on the agreement, after President Donald J. Trump announced that the U.S. would withdraw from the accord last June.

President Daniel Ortega announced that Nicaragua would join the deal on September 20: "We have to be in solidarity with this large number of countries that are the first victims, who are already the victims and are the ones who will continue to suffer the impact of these disasters."
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