is happening in the arctic circle region. — is happening in the arctic circle region, where the temperatures have risen already by three celsius above the preindustrial level whereas the planet— the preindustrial level whereas the planet as _ the preindustrial level whereas the planet as a whole is at 1.3. in the melting _ planet as a whole is at 1.3. in the melting of— planet as a whole is at 1.3. in the melting of ice on green is a looking as if it's _ melting of ice on green is a looking as if it's becoming a reversible. sea teveis _ as if it's becoming a reversible. sea levels would rise by 23 or 24 feet as _ sea levels would rise by 23 or 24 feet as that continues. and we will see massive emissions of methane, which _ see massive emissions of methane, which is _ see massive emissions of methane, which is another greenhouse gas. let me come _ which is another greenhouse gas. let me come to — which is another greenhouse gas. let me come to the antarctic. it's wonderful— me come to the antarctic. it's wonderful to have lives here because we need _ wonderful to have lives here because we need this expertise to tell us what _ we need this expertise to tell us what is — we need this expertise to tell us what is happening to the overturning current— what is happening to the overturning current as _ what is happening to the overturning current as a — what is happening to the overturning current as a result of ice entering into the _ current as a result of ice entering into the sea — current as a result of ice entering into the sea and then dropping to the bottom of the ocean. reducing saiinity~ _ the bottom of the ocean. reducing salinity. what i think the estimate is it by— salinity. what i think the estimate is it by mid — salinity. what i think the estimate is it by mid century, the overturning current in that region will he _ overturning current in that region will be reduced by about 40%. there is another— will be reduced by about 40%. there is another factor that i think that