In the middle of the night, Casandra Cabrera stopped breathing. She doubled over in bed, gasping for air. The asthma attack continued for 10 long minutes. The San Joaquin Valley, Calif., teenager lives in a state where more than 5 million people have been diagnosed with asthma, which is caused, in part, by contamination from nitrogen compounds. Climate change is expected to compound the issue, according to a new body of work published in the journal Issues in Ecology.