We present a study about gender differences towards anthropogenic impact on climate change, as discovered from the climate change debate on Twitter. Our dataset consists of about 250,000 tweets and retweets for which the authors' gender was identified. We researched the hashtags and usernames that were proportionately more frequently mentioned by either male or female tweeters. Our results show significant differences between female and male tweeters, with female tweeters mentioning significantly more campaigns and organizations with a convinced attitude towards anthropogenic impact on climate change, and male tweeters mentioning significantly more private persons and usernames with a sceptical stance. Copyright © 2014 ACM.