In discussing international agreements, cautious people often say "Trust, but verify". In considering ways to reduce carbon dioxide emissions, what is the significance of this need to verify compliance with treaties? Group of answer choices Treaty verification on CO2 is possible if all countries switch to natural gas, which is easier to track Treaties actually can be verified by measuring CO2 concentrations in the atmosphere and other geophysical data, and by tracking economic activity Treaty verification is possible only if every country buys all of their cars from China, because Chinese cars all have CO2 sensors built in Treaty verification on CO2 is impossible, because the CO2 falls out of the air so quickly Treaty verification on CO2 is impossible, because Asian countries can hide their emissions so easily