Final Environmental Science (20 points total) Name__Valentina Velasquez_____
I Cycles in nature (7 points total)
1. Draw a simple balanced carbon-oxygen cycle between plants and animals, using
photosynthesis and oxygen as well as cellular respiration and carbon dioxide. 1 pt
2. What gas does the combustion of fossil fuels in transportation and industry produce and
what does this gas do to the carbon cycle and global temperature? 1 pt
Burning fossil fuels like gasoline and diesel releases carbon dioxide, a greenhouse gas,
into the atmosphere. In 2019, CO2 emissions accounted for about 80% of total U.S.
anthropogenic GHG emissions (based on 100-year global warming potential). Fossil fuel
combustion (burning) for energy accounted for 74% of total U.S. GHG emissions and
for 92% of total U.S. anthropogenic CO2 emissions. CO2 emissions from other
anthropogenic sources and activities were about 6% of total GHG emissions and 8% of
total CO2 emissions.
3. What are two concerning effects of climate change? 1 pt
a. Increased heat, drought and insect outbreaks, all linked to climate change, have
increased wildfires.
