Gasification technology has improved dramatically by 21st century developments in order to expand the market and efficiency of the waste to energy industry. (fullcyclefund.com)
This is a model for 21st century development, and we should see this model become the norm in the U.S. in the coming decades. (treehugger.com)
This book is an attempt to give an overview of the twentieth century developments in ecumenical missiology. (religion-online.org)