{The climate change community is divided between those who believe the goal should be to eliminate the earth's greenhouse effect altogether, and those who argue that we should attempt to minimize earth's greenhouse effect.} -a) true +b) false {In the arctic, soot tends to warm the earth.} +a) true -b) false {The [[:File:Mauna_Loa_Carbon_Dioxide_Apr2013.svg|Keeling curve]] shows that carbon dioxide concentrations} -a) show a steady rise in CO2 levels, at constant slope, and irregular fluctuations due associated with El Ninos and La Ninas. -b) show a steady rise in CO2 levels, at constant slope, and regular and predictable annual fluctuations +c) show a steady rise in CO2 levels, with increasing slope, and regular and predictable annual fluctuations {The lede's "[[:File:Global_Warming_Observed_CO2_Emissions_from_fossil_fuel_burning_vs_IPCC_scenarios.svg|CO2 Emissions per Year]]" graph (1990-2010) shows dips and rises that are caused by changes in} -a) the earth's distance from the sun -b) worldwide efforts to curtail emissions +c) the world economy -d) the sun's energy output {How is the validity of a computer model typically tested?} -a) by making predictions about future years and seeing if they come true. -b) by verifying its ability to calculate current climate conditions. +c) all of these are true -d) by verifying its ability to calculate past climate conditions. {Ocean temperatures are increasing more slowly than land temperatures because oceans have more heat capacity and because evaporation cools the water.} +a) true
{The climate change community is divided between those who believe the goal should be to eliminate the earth's greenhouse effect altogether, and those who argue that we should attempt to minimize earth's greenhouse effect.} -a) true +b) false {In the arctic, soot tends to warm the earth.} +a) true -b) false {The [[:File:Mauna_Loa_Carbon_Dioxide_Apr2013.svg|Keeling curve]] shows that carbon dioxide concentrations} -a) show a steady rise in CO2 levels, at constant slope, and irregular fluctuations due associated with El Ninos and La Ninas. -b) show a steady rise in CO2 levels, at constant slope, and regular and predictable annual fluctuations +c) show a steady rise in CO2 levels, with increasing slope, and regular and predictable annual fluctuations {The lede's "[[:File:Global_Warming_Observed_CO2_Emissions_from_fossil_fuel_burning_vs_IPCC_scenarios.svg|CO2 Emissions per Year]]" graph (1990-2010) shows dips and rises that are caused by changes in} -a) the earth's distance from the sun -b) worldwide efforts to curtail emissions +c) the world economy -d) the sun's energy output {How is the validity of a computer model typically tested?} -a) by making predictions about future years and seeing if they come true. -b) by verifying its ability to calculate current climate conditions. +c) all of these are true -d) by verifying its ability to calculate past climate conditions. {Ocean temperatures are increasing more slowly than land temperatures because oceans have more heat capacity and because evaporation cools the water.} +a) true