1. Question : The greenhouse effect is caused by the burning of fossil fuels. 2. Question : Over the U.S., ozone levels have fallen 5-10%, depending on the season. 3. Question : Net-zero energy refers to a building or installation that produces as much energy as it consumes, considered to be energy self-sufficient or near self-sufficient. 4. Question : According to the World Bank, climate change adaptation practices may cost as much as how much each year by 2030? 5. Question : Life-cycle cost is the sum of all recurring and one-time (non-recurring) costs over the full life span of a good, service, structure, or system. 6. Question : According to USGCRP data, since pre-industrial times (around 1850) atmospheric carbon dioxide (CO2) has increased by what percentage? 7. Question : Which country is the global leader in the number of solar power systems installed per capita? 8. Question : The CSIRO estimates that by 2050 average temperatures in Australia will rise by how much? 9. Question : Hydropower represents what percentage of total electricity production globally? 10. Question : In 2010, global private investments in nuclear energy totaled what value?