It has been claimed that television networks should provide equal time for the presentation of opposing views whenever a television program concerns scientific issues -- such as those raised by the claims of environmentalists -- about which people disagree  However, although an obligation to provide equal time does arise in the case of any program concerning social issues, it does so because social issues almost always have important political implications and seldom can definitely be settled on the basis of available evidence
If a program concerns scientific issues, that program gives rise to no such equal time obligation
Many scientific issues have important political implications and cannot be definitely settled on the basis of the available evidence.