Ascientist is trying to determine the relationship between clams snails and squid when she generates a molecular clock she is surprised to see that clams and squid are more closely related then clams and snails which did the molecular clock data show

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.