1. Fuel cells, hydrogen batteries

____ ____ (_____ _____) would use hydrogen to produce electricity to power cars, homes, computers, etc.

2. hydrogen, fuel cell

Governments are funding research into _______ and ____ _____ technology.

3. Germany

_______ is one of several nations with hydrogen-fueled city buses.

4. costly, infrastructure, stratospheric ozone, greenhouse gases, 4H2, CO2

Drawbacks of hydrogen and fuel cells:
- Need massive and _____ development of _________
- Leakage of hydrogen can deplete ________ ____
- It may produce few ________ ____ (CH4 + 2H2O = _____ + _____)

5. hydrogen, nontoxic, gasoline, 90, silent, nonpolluting, recharged

Benefits of hydrogen and fuel cells:
- We will never run out of ______
- It can be clean and _____ to use
- If kept under pressure, it is no more dangerous than _______ in tanks
- Cells are up to __% energy efficient
- Fuel cells are _____ and ________ and won't need to be ________

6. Sustainability

Living in a way that can be lived far into the future. Conserving resources, protecting ecological processes, and eliminating waste and pollution.

7. Sustainable solution

Results in renewable resource use.

8. capital, replenished, depleted, preserved

With sustainable solution natural ______ is _______ so resources aren't _______ while ecosystem services are ________.

9. ecological footprint, resource

College campuses have a large ________ _______ and are centers of high _______ consumption.

10. Students, change, students, peers

_______ are often the ones to initiate _____. ______ who engage in sustainability efforts serve as models for their _____.