PITTSBURGH -- Since 1970, April 22 has marked the observance of Earth Day, and Pittsburgh celebrated it on Wednesday.

An Earth Day rally was held downtown in Market Square, where Mayor Luke Ravenstahl talked about the city's effort to become more environmentally friendly.

Link: Western Pennsylvania's Green Buildings
Video: Earth Day In Pittsburgh

Ravenstahl spoke about the city's green initiatives and his vision for a sustainable future.
Link: Mayor Announces $100K Green Initiative Fund

After the rally, the Pirates also observed Earth Day with an "energy-free day" in their afternoon game against the Florida Marlins at PNC Park.

All energy used at the ballpark Wednesday was renewable, the Pirates said. Also, for every dollar spent on energy, $1 will be donated to national energy-resource development.

The Bucs offered $5 off any ticket priced $12 or more for fans who rode their bicycles to the game, where the team continued its "Let's Go Bucs. Let's Go Green" campaign.

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