読解問題の選択肢がなぜ不適切な選択肢なのか判断できません、、
以下の文章と問について答えがAらしいのですが納得できません、、Bのようにも思えるのでなぜBは不正解なのかご教示いただきたいです。
Over time, increasing urban heat islands affect climatological temperature records, producing artificial warming in climatic records taken in cities. This warming, therefore, must be accounted for in interpreting climate change over the past century.
Paragraph 3 supports which of the following claims about the interpretation of temperature records?
A.The climate may not be warming as much as the increase of temperatures recorded in cities appears to suggest.
B.Records show that the increase in urban heat islands has had a significant warming effect on the global climate.
