challenges of our world
challenges and hopes for the future
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ACIDRAIN
BIOETHICS
BIOWARFARE
DEFORESTATION
ECOLOGY
GREENHOUSE
OZONELAYER
RACHELCARSON
G | D | A | A | M | O | S | G | K | X | B | I | U | W | Q |
B | I | O | E | T | H | I | C | S | F | K | R | B | N | N |
X | A | V | R | E | Y | A | L | E | N | O | Z | O | N | S |
K | N | I | P | O | J | K | X | N | Q | E | I | O | O | N |
E | D | V | B | W | V | D | E | J | W | T | S | G | Q | M |
R | Z | N | I | A | R | D | I | C | A | R | Q | B | U | T |
A | T | Y | O | Y | Y | A | O | T | A | L | V | A | X | K |
F | N | G | B | X | Q | U | S | C | P | K | W | G | X | X |
R | V | O | W | E | X | E | L | M | R | H | B | Z | W | F |
A | R | L | P | G | R | E | E | N | H | O | U | S | E | J |
W | A | O | C | O | H | D | Y | X | I | I | G | U | Z | B |
O | H | C | F | C | A | D | N | Z | F | T | X | S | T | W |
I | E | E | A | D | W | L | M | V | L | E | U | Z | N | V |
B | D | R | W | N | W | E | U | T | K | E | V | G | J | G |
E | F | G | I | J | M | A | T | L | D | B | P | Z | H | X |
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