Although record summer heat has been shifting public opinion on global warming, research co-authored by Temple political scientist Megan Mullin suggests that the weather on the day when opinion surveys are taken can skew results. Mullin and her co-author found that for every three degrees above normal that local temperatures reached in the week before the day on which Americans were contacted for opinion polls, they were one percentage point more likely to agree there is "solid evidence" the earth is getting warmer. The effects reverse as temperatures cool.