question: What factors were taken into account in the estimate published in 2000 on solar energy ?
answer: insolation , cloud cover , and the land that is usable by humans
turker_answer: Insolation , cloud cover , and the land that is usable by humans were taken into account in the estimate published in 2000 on solar energy .
rule-based: Insolation , cloud cover , and the land that is usable by humans were taken into account in the estimate published in 2000 on solar energy .