Bhutan has pioneered the use of Gross National Happiness (GNH) as a measure of progress, instead of the more commonly used GNP. GNH measures not only economic activity, but also cultural, ecological, and spiritual well-being. In September 2010, Bhutanese Prime Minister Jigmi Y. Thinley visited the United States to promote GNH education and economic theory. Prakash: What difference has it made to have GNH as your yardstick rather than gross domestic product? Thinley: First, we are promoting sustainable and equitable socioeconomic development which can be measured to a larger extent through conventional metrics. Second is the conservation of a fragile ecology, [using] indicators of achievement, [such] as the way the [vegetation] cover in my country has expanded over the last 25 years from below 60 to over 72 percent. The third strategy is promotion of culture, which includes preservation of the various aspects of our culture that continue to be relevant and supportive of Bhutan's purpose as a human civilization. No Bhutanese should suffer a sense of insecurity arising from loss of their cultural identity, language, and so on, under the onslaught of modernization. Then there is the fourth strategy-good governance-on which the other three strategies or indicators depend. We know that democracy is the best form of governance.