Anchor: While the current Clean Air Act has played a role in significantly improving some of these issues, additional reductions in the emissions of SO2, NOx, and mercury are necessary to address persistent public health and environmental problems.
Entailed: The Clean Air Act played a role in improving the environment.
Contradiction: The Clean Air Act did nothing to improve the environment.
Contradiction: I had so many answers for that one
Contradiction: The construction worker has a white hard hat.
Contradiction: The Vice President is solely responsible for interpreting the term agency. 
Contradiction: There are often lots of people in the Piazza del Duomo.