Which of the following is true or accurate about the transition to renewable energies?
A) Coal can continue to be used as long as we keep atmospheric CO2 levels below 800 ppm.
B) Natural gas, which produces less CO2 when burned, can serve as a bridge energy to the development of enough renewable energies.
C) At present none of the U.S. states has any requirements or goals for the transition.
D) Venture capitalists have invested very little in global renewable energy because of uncertainty about its effectiveness.
Question 2
Many predator-prey relationships do not result in the complete elimination of the prey because
A) predators cannot catch all of the healthy adults and will shift to other prey if one species is scarce.
B) the predator population is limited by the availability of territorial space.
C) a single species of prey does not provide enough nutrition.
D) the prey populations are always far below carrying capacity.
The T → R transition
Three Methods of Mining Coal
This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev
The production of electricity from coal is inefficient
Growth of a Renewable Resource
Pennsylvanian-Age Coal Swamp