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The article focuses on the life and career of professor Tom Schelling at the University of Maryland. Topics discussed include one factor that perhaps influenced his choice of the University of Maryland, one of his contributions on the challenge of climate change, and factors that made him a skeptic of the notion that nations should be allocated some share of cumulative emissions and implement a cap and trade regime.

Aims Drug policy strategies and discussions often use prevalence of drug use as a primary performance indicator. However, three other indicators are at least as relevant: the number of heavy users, total expenditures and total amount consumed. This paper stems from our efforts to develop annual estimates of these three measures for cocaine (including crack), heroin, marijuana and methamphetamine in the United States. Methods The estimates exploit complementary strengths of a general population survey ( National Survey on Drug Use and Health) and both survey and urinalysis test result data for arrestees ( Arrestee Drug Abuse Monitoring Program), supplemented by many other data sources. Results Throughout the 2000s US drug users spent in the order of $100 billion annually on these drugs, although the spending distribution and use patterns changed dramatically. From 2006 to 2010, the amount of marijuana consumed in the United States probably increased by more than 30%, while the amount of cocaine consumed in the United States fell by approximately 50%. These figures are consistent with supply-side indicators, such as seizures and production estimates. For all the drugs, total consumption and expenditures are driven by the minority of users who consume on 21 or more days each month. Conclusions Even for established drugs, consumption can change rapidly. The halving of the cocaine market in five years and the parallel (but independent) large rise in daily/near-daily marijuana use are major events that were not anticipated by the expert community and raise important theoretical, research, and policy issues. [ABSTRACT FROM AUTHOR]

In this article Jonathan P. Caulkins, Beau Kilmer, Peter H. Reuter and Gregory Midgette respond to commentaries within the issue which focus on their article "Cocaine’s Fall and Marijuana’s Rise: Questions and Insights Based on New Estimates on Consumption and Expenditures in US Drug Markets". In the article they offer opinions on several points which are raised within the commentaries and on several aspects of their own article which are discussed in the commentaries.