<p><i>This coverage is made possible through a partnership between WBEZ and </i><a class="Link" href="http://grist.org/" target="_blank" ><i>Grist</i></a><i>, a nonprofit environmental media organization.</i></p><p>Serap Erdal stopped at a light pole in the middle of Grant Park and pulled out her phone. Behind her, the city’s towering skyscrapers cut into a sunny, blue sky as she zoomed in on her palm-sized map of the city. The researcher barely noticed the hum of buses, cars and cyclists buzzing in front of her.