المؤلفون: Lynas, Mark

المؤلفون: Matthews, Samuel W., Sugar, James A.

المصدر: National Geographic Magazine, 1990, Vol. 178, No. 4, P. 66.

Other Title: Is Our World Warming?

المؤلفون: Hodgson, Bryan

المصدر: National Geographic Magazine, 1990, Vol. 177, No. 4, P. 2.

المؤلفون: Rizzo, Johnna

المصدر: National Geographic Magazine, 2013, Vol. 223, No. 4, P. 19.

Other Title: Healing the Ozone Layer

المصدر: National Geographic Magazine, 1999, Vol. 196, No. 4, P. 141.

المصدر: National Geographic Magazine, 1994, Vol. 186, No. 6, P. 152.

المؤلفون: Grove, Noel, Spiegel, Ted, Bond, William H.

المصدر: National Geographic Magazine, 1987, Vol. 171, No. 4, P. 502.

Other Title: An Atmosphere of Uncertainty ; Are We Poisoning Our Air?

المصدر: National Geographic Magazine, 1989, Vol. 176, No. 5, P. 536.