Crossword Puzzle
Clues
Across
1. The three  R s that offer a guide to helping you lessen your impact on the environment and create a
more sustainable world.
2. One of the factors that causes global warming, desertification, and loss of topsoil. It is often a result of
poor management of natural resources.
3. The most abundant element in the universe. It can be used as a fuel source.
4. These plentiful and useful organisms consume carbon dioxide, convert it to food, and produce oxygen.
5. The program endorsed by the US Environment Protection Agency to reduce energy use mainly in
household appliances and heating and cooling units.
6. The most toxic greenhouse gas emission. It is common around landfills and farms.
7. It gives people the power to make environmental policy a priority  age 18.
8. The name given to gasses that trap heat and cause global warming.
9. A tool used to illustrate how much impact a human being has on the Earth.
10. A transportation vehicle using a combination of electricity and gasoline.
11. The most abundant energy source capable of being harnessed by humans.
12. It combines Hydrogen and Oxygen to create energy that can be used in cars.
13. The government agency which monitors environmental issues (acronym).
Down
1. Energy that can be used and reused an infinite number of times.
2. It was started in 1970 by Senator Gaylord Nelson and Dennis Hayes. It is celebrated by over 500
million people around the globe on April 22 every year.
3. Living within the limits of earth s natural resources.
4. The term given to food sold in supermarkets and grown or fed without synthetic fertilizers, chemicals,
hormones, and antibiotics.
5. The type of fuel humans depend on most. It is nonrenewable and found underground.
6. The cleanest fossil fuel, most often found in fragile areas of nature.
7. The most common greenhouse gas. Humans breathe it out and trees consume it
8. An international treaty giving countries a timeline to reduce their emissions of greenhouse gases. It has
not been signed by the United States.
9. Another name for buyers. They can influence what products are carried in stores.
10. The part of the earth s atmosphere that repels the sun s ultraviolet rays.
11. This important layer of dirt is essential for ensuring plant growth and its nutrients are retained by trees.
Over time, it is washed away by agriculture.
12. An interdependent community of organisms including plants, animals, water, air and the ground.
13. The most efficient form of transportation in terms of energy usage. It does not pollute.
The answers to the Crossword Puzzle come from lessons in the Ecological Footprint curriculum unit, but here
are some additional clues.
Rearrange the letters into words that fit the above clues.
Across
1. ERYEUSCDCERLUERECE ____________________________________________
2. TESTONIFEDRAO ____________________________________________
3. DGRENYOH ____________________________________________
4. ESERT ____________________________________________
5. RGEYNE ASTR ____________________________________________
6. NHETEAM ____________________________________________
7. EOTV ____________________________________________
8. NOEERHUSGE ____________________________________________
9. GLCOOCALIE TROPITNFO ____________________________________________
10. YHRBDI ACR ____________________________________________
11. SLRAO YGNEER ____________________________________________
12. LEUF ELCL ____________________________________________
13. APE ____________________________________________
Down
1. WEAENBELR EGERYN ____________________________________________
2. TRAHE YDA ____________________________________________
3. STILABAUSNE ____________________________________________
4. NGACIRO ____________________________________________
5. SISLOF USLEF ____________________________________________
6. URLAANT AGS ____________________________________________
7. ROBNCA OXIIEDD ____________________________________________
8. YOTKO YRAETT ____________________________________________
9. UMSNOESRC ____________________________________________
10. NZOEO RAYEL ____________________________________________
11. TLPSOOI ____________________________________________
12. ETSSMEYCO ____________________________________________
13. LYCCEIB ____________________________________________
2
Crossword Puzzle
Crossword Puzzle
1 4
1 2 3
7
2 5 6
8
3
4
9
5
6
7 10
8
9 11
12 10
11 13
12
13
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Crossword Puzzle
Crossword Puzzle
Answers
R1 O4
R1 E D U C E R E2 U S3 E R E C Y C L E
N A U G C7
E D2 E F5 O R E S T A T I O N6 A
W O T T N A R
A S H A I T B
B S D I C K8 U O
L I A N H3 Y D R O G E N
T4 R E E S L Y A O A D
E F B T L I
N U L O G O
E E E T A X
R L R S I
G S C9 E D
Y O A E
E5 N E R G Y S T A R
S Y
U
M6 E T H A N E
V7 O10 T E
Z R
G8 R E E N H O U S E
N
E
E9 C O L O G I C A L F O O T P R I N T11
A O
E12 H10 Y B R I D C A R P
C E S
S11 O L A R E N E R G Y B13 O
S I I
Y F12 U E L C E L L
S Y
T C
E13 P A L
M E
4
Crossword Puzzle
 Crossword Puzzle
Answers
Across
1. Reduce-Reuse-Recycle
2. Deforestation
3. Hydrogen
4. Trees
5. Energy Star
6. Methane
7. Vote
8. Greenhouse
9. Ecological Footprint
10. Hybrid Car
11. Solar Energy
12. Fuel Cell
13. EPA
Down
1. Renewable Energy
2. Earth Day
3. Sustainable
4. Organic
5. Fossil Fuels
6. Natural Gas
7. Carbon Dioxide
8. Kyoto Treaty
9. Consumers
10. Ozone Layer
11. Topsoil
12. Ecosystem
13. Bicycle
5
Crossword Puzzle