Which nation surpassed the united states as the world's leading emitter of carbon dioxide and other greenhouse gases in 2007? a) china b) india c) japan d) taiwan

The answer is A) China. I hope this helps!

Explanation:

I did it on USA Test Prep

norsemen from northern countries had made earlier journeys

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: