"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

Parents and young child at anti KXL pipeline protest.

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

Senior man & woman at anti KXL protest.

Senior man at anti KXL protest.

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

Young woman in skeleton make-up at anti KXL protest.

Young woman in skeleton make-up at anti KXL protest.

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

Anti KXL pipeline protester holding "global warming crime scene" tape.

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"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

"Draw the Line Against Keystone XL Pipeline" march in Denver, Colorado. (9/21/13)

Senior woman at anti KXL pipeline protest.

Anti KXL pipeline sign with Canadian flag in the background.

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Native Americans march in anti KXL protest.