Pollution and environmental hazards

1680 × 990

Pollution and environmental crisis

1280 × 1024

Smokestacks Emitting Smoke — Black

1280 × 800

Penguin in polluted alley

1024 × 768

Pollution and environmental hazards

1280 × 1024

Nuclear Power Plant Cooling Towers — Gray

1200 × 960

Polar Bears on Ice — White, Dramatic, Winter, Photograph

1200 × 960

Monkey and Child Face

1024 × 768

Hourglass with City and Ice

1534 × 1293

Penguins in a polluted alley

1280 × 800

Polar bear in urban alley

1024 × 768

Earth on fire

1440 × 900