The presence of carbon dioxide (CO2) in the atmosphere is one of the primary causes of the greenhouse effect. CO2 emissions come from a variety of natural sources; however, human-related emissions are responsible for the increase of the atmospheric concentration of CO2 by 40% since the industrial revolution (from 280 ppm of CO2 in 1750 to 400 ppm in 2015). Unless reverted, that trend poses a real threat to the environmental balance of the Earth: melting of glaciers, the rise of the sea level and coastal flooding, changes in precipitation, and acidification of oceans, which threaten numerous ecosystems. The main human activity that emits CO2 is the combustion of fossil fuels (coal, natural gas, and oil) for energy, transportation, and the industry.
Show More »« Show Less
Barclays Cycle Hire Bike: Shows some of the key features of the bike: small luggage rack in the front of handlebar (with elastic cord and open at the sides), kickstand, rear mudguard, and dynamo-powered rear LED light.
More »« Less
Bitlock Bike Lock Front: The U-shaped lock is made of reinforced and heat-treated steel, and features a bent shackle foot design for increasing security.
More »« Less
Bitlock Components Disassembled: The U-Lock and internal components: Li-SOCl2 battery, electric motor attached to locking/unlocking mechanism, and circuit boards.
More »« Less
World Energy Consumption by Sector - 2011: The industrial sector accounts for 51% of electricity consumption worldwide (EIA data). For the combined commercial and residential sectors, losses in electricity generation, transmission, and distribution, account for almost 50% of the total consumption.
More »« Less
Solar Parabolic Trough Receiver with Glass Envelope - Diagram: The heat collection element (the receiver) includes an evacuation nozzle, and glass to metal seals to preserve the vacuum between the glass envelope and the metal tube. Chemical sponges indicate the status of the vacuum.
More »« Less
