Eric Walker added Are ‘Heat Pumps’ the Answer to Heat Waves? Some Cities Think So. - The New York Times to Denver, Heating, ventilation, and air conditioning (HVAC) and Berkeley

Eric Walker added The Great American Single-Family Home Problem - The New York Times to a number of topics

Eric Walker added a number of topics and a number of links to San Francisco Bay area, and added San Francisco Bay area to California

Eric Walker added University of California at Berkeley (Cal) and Are ‘Heat Pumps’ the Answer to Heat Waves? Some Cities Think So. - The New York Times and The Great American Single-Family Home Problem - The New York Times to Berkeley, and added Berkeley to San Francisco Bay area and Cities in California

Eric Walker added a number of topics and Sacramento shooting: At least six dead in centre of California state capital - BBC News to Cities in California, and added Cities in California to California and Cities in the United States

Eric Walker added The Wealth Detective Who Finds the Hidden Money of the Super Rich to University of California at Berkeley (Cal), and added University of California at Berkeley (Cal) to University of California and Berkeley