Taking into account possible consequences of global warming and ozone layer weakening induces world's public to take interstate agreements on production activity restriction. This involves enormous financial expenses. Hence, it is necessary to know the reasons of the occurrence of one or other ecological phenomenon in taking the agreements. For this purpose, high-accuracy observational data on spectral reflective characteristics of the Earth as a whole are required. Only when astrophysical methods are applied to the Earth investigation can effects caused by the Earth's spectral reflectance change be estimated. With this aim in view, complex observations from stations placed well beyond the terrestrial surface (for instance, on the Moon's surface or in one of the Lagrangian points) are required. This will allow one to perform the complex studies of the Earth as a starlike object. The main methods of the observations and instruments necessary for studies of this sort are listed.