Carbon dioxide is the most abundant greenhouse gas the most potent (per molecule gas. of the greenhouse gases the only greenhouse gas presently decreasing in the atmosphere the main anthropogenic greenhouse gas produced in the united states the only greenhouse gas presently increasing in the atmosphere

the main anthropogenic greenhouse gas produced in the united states.

Anthropogenic means that the man is the responsible for its generation.

Fuel consumption for vehicles, factories and houses generates huge amounts of CO2.

Let's review the other options:

a. the most abundant greenhouse gas

FALSE: The most abundant greenhouse gas is water vapor.

b. the most potent (per molecule) gas. of the greenhouse gases

Methane is considered more potent than CO2 as heat-trapping.

c. the only greenhouse gas presently decreasing in the atmosphere

CO2 has not decreased but increased.

d. the main anthropogenic greenhouse gas produced in the united states

TRUE as stated initially

e. the only greenhouse gas presently increasing in the atmosphere

FALSE: Methane (CH4) is also increasing.

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.