Вот теперь убедили

Our analysis suggests some immediate practical recommendations for humanity. One recommendation is that messages to extraterrestrials should be written cautiously. <...> Another recommendation is that humanity should avoid giving off the appearance of being a rapidly expansive civilization. <...> These scenarios give us reason to limit our growth and reduce our impact on global ecosystems. It would be particularly important for us to limit our emissions of greenhouse gases, since atmospheric composition can be observed from other planets.

http://arxiv.org/ftp/arxiv/papers/1104/1104.4462.pdf

(найдено благодаря Остапу Кармоди) и Иэну Сэмплу)