My grandmother was pleased when I told her I was heading to Ethiopia last November for an international conference focused on population, health, and the environment.

Evaluation is the lifeblood of any development effort – it’s how implementers know if they’re making a difference, determine what to do more or less of, and enables funders to evaluate cost-effectiveness. But it’s also an inexact science, no more so than when it comes to complex interventions that cut across sectors. [Video Below]

USAID funding is “far outstripped” by private investment and business relationships in “nearly every country” in which it works – and that’s a good thing, according to USAID Administrator Rajiv Shah. [Video Below]

What are the environmental implications of changing household sizes? A recent article by Mason Bradbury, M. Nils Peterson, and Jianguo Liu, published in Population and Environment, analyzes data from 213 countries over 400 years and finds the average number of occupants per home tends to decline as population grows. This dynamic, they write, indicates that accommodating housing could prove to be one of “the greatest environmental challenges of the twenty-first century.” As countries develop and urbanize, “according to convergence theory, household size decreases (often from greater than five to less than three).” Other cultural shifts, like increasing divorce rates, urban sprawl driven by rising affluence, decreasing numbers of multigenerational households, and larger houses (in the United States, homes more than doubled in size between 1950 and 2002, according to the article) compound the issue. As population growth continues in parts of the world, these trends pose critical questions for conservation and environmental sustainability, since “households are the end consumers of most natural resources and ecosystem services.”

Earlier this week, the Department of Defense released its first Quadrennial Defense Review since fiscal cliffs, shutdowns, and spending cuts hit the federal government. Not surprisingly, “austerity” shows up in almost every chapter of the report. What shows up even more? Climate change. For the second QDR in a row, the Pentagon has called out climate change as a “significant challenge for the United States and the world at large.”