1. POZNAN:
Poland struggles with coal addiction while hosting world climate conference

Poland is in the climate change hot seat this week as the city of Poznan hosts thousands of international delegates trying to hammer out a treaty to reduce the world's greenhouse gas emissions. Yet even as Poland basks in the pride of helping to lead a massive global environmental effort, this coal-addicted Eastern European country is mired in a messy internal battle over how -- and whether -- to wean itself off the black stuff. Go to story #1

2. TRANSPORTATION:
A rapid shift to fuel-saving hybrid buses

In Troy, Mich., engineers are tweaking what they believe to be the public transit vehicle of the future: a super-lightweight hybrid bus. The GTB-40 is made of a high-strength steel that will last longer than most bus frames. Its builder, Fisher Coachworks, says the chassis allows it to zip along with half the weight of its peers. And its hybrid-electric engine not only consumes less fuel, but also stores electric energy whenever a driver hits the brakes. Go to story #2