Why has China overtaken the United States as the top energy consumer in the
world?

Voracious energy demand also helps explain why China—which gets most of its electricity from coal, the most polluting of fossil fuels—passed the U.S. in 2007 as the world's largest emitter of carbon-dioxide emissions and other greenhouse gases.

Explanation:

separation of church and state? not sure what you mean.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.