Final answer:
The statement is false; some GHGs that can result from flooding, like methane, have a higher global warming potential than CO2 and are thus more effective at trapping heat in the atmosphere.
Step-by-step explanation:
The assertion that the greenhouse gases (GHGs) that come from flooding aren't nearly as strong as CO2 for creating the greenhouse effect is false. Different GHGs have varying global warming potentials (GWP). For instance, methane (CH4) is approximately 28 times more effective than carbon dioxide (CO2) at absorbing infrared radiation, and nitrous oxide (N2O) is 298 times more potent. Fluorinated gases can even be thousands of times more potent, in part due to their longer atmospheric residence times. CO2 itself is a significant GHG that has seen a substantial increase in atmospheric concentration since the industrial revolution, and at higher concentrations, it contributes to a greater greenhouse effect, albeit logarithmically rather than linearly.