The Millennium Development Goals by the United Nations included a global target for Improved Water Source to reach 88% of global population by 2015. By 2010, the global target was reached. However, there are still millions of people lacking the improved access to drinking water. We propose the...

Terrestrial protected areas are an important tool for biodiversity conservation. Recent expansion of terrestrial projection areas is such that fifty countries have already reached or exceeded the 17% target to be realized by 2020. This research examines whether countries with low level of...

An estimated 804,000 suicide deaths occurred in 2012, representing an annual global age-standardized suicide ratio of 11.4 per 100,000 populations. Suicide ratios are not distributed evenly across people or places, varying by income level, gender, and age. Changes in suicide ratios over time...

Two measures of fine particulate matter, PM2.5 exposure and PM2.5 exceedance are used to analyze convergence patterns of 212 and 108 countries during the period of 2000 to 2014. For PM2.5 exposure, sigma index diverges at the annual rate of 1.07%, while gamma index converges at -0.5% rate. For...