Penguin in Alley — Black, Dramatic

1200 × 827

Polar Bear in Alley — Gray, Dramatic, Photograph

2560 × 1600

Polar Bear in Alley — Gray, Dramatic, Digital Art

1024 × 768

Polar Bear in Alley — Gray, Dramatic

1024 × 768

Hourglass with City and Ice

1534 × 1293

Pollution and environmental hazards

1280 × 1024

Pollution and environmental crisis

1280 × 1024

Monkey and Child Face

1024 × 768

Three Bottles with Pollution — Green, Dramatic

1680 × 990

Smokestacks Emitting Smoke — Black

1280 × 800

Penguin in polluted alley

1024 × 768

Burning Earth Planet — Orange, Dramatic

1440 × 900