段1
①The social sciences are flourishing. ②As of 2005, there were almost half a million professional
social scientists from all fields in the world, working both inside and outside academia. ③According to the World Social Science Report2010, the number of social-science students worldwide has swollen by about 11% every year since 2000.
段2
①Yet this enormous resource is not contributing enough to today’s global challenges, including climate change, security, sustainable development and health. ②These issues all have root causes in human behavior: all require behavioral change and social innovations, as well as technological development. ③Stemming climate change, for example, is as much about changing consumption patterns and promoting tax acceptance as it is about developing clean energy. ④Humanity has the necessary agro-technological tools to eradicate hunger, from genetically engineered crops to artificial fertilizers. ⑤Here, too, the problems are social: the organization and distribution of food, wealth and prosperity.
问：E选项开头的These issues为代词指代，与上文哪部分内容相对应？
A : global challenges
B : social sciences
C : agro-technological tools
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