GGR 314 |43 Test 3 Questions And Answers|2024

According to the study presented in the lecture notes, what effect is global warming expected to have of US yields of corn and soybean by the end of the century, in the absence direct beneficial effects of higher CO2 concentration and of adaptation? - ️️corn yield is projected to decrease 40-80% and soybean yield is projected to drop 35-75% By what factor has the maximum mammal body mass increased over the last 70 million years, while the Earth has cooled by 5-7ºC? - ️️1000 times By what percentage is the mass of the shells of calcareous planktonic organisms in the oceans estimated to have already decreased on average since the start of the industrial revolution? What is the evidence for this? - ️️30-35% found by comparing todays specimens to those in sediments Define the term wetbulb temperature - ️️the lowest temperature that can be achieved through evaporation and it depends on relative humidity of the air and the air temperature For two different time periods in the last 5 million years, give (a) a name of the time period, the age of the time period, how much warmer global average temperature is estimated to have been, and how much higher global average sea level is estimated to have been. Period 1: Period 2: - ️️last interglacial period: 130,000 ya and sea level was 6-9 m higher than today. Middle Pliocene: 3 mya and sea level was 25 +/- 10 m higher than today. Higher CO2 increases net photosynthesis in C3 plants by reducing what process? - ️️decreases photorespiration How fast might climatic zones in NH midlatitudes shift during the next century? - ️️500 km per 100 yrs How much could sea level rise at the end of the century differ from the global mean at London and New York? - ️️New York up 0.2 m and London up 0.1 m How much is global warming calculated to have already affected global production of maize? - ️️reduced maize production by 3.8% How much is global warming calculated to have already affected global production of wheat? - ️️reduced wheat production by 5.5% How much is sea level estimated to have risen during the past century? - ️️0.2 m