Read this passage from nasa about climate change. based on the details in this paragraph, what is the best one-sentence summary? various natural physical processes modify the atmosphere, oceans and land surfaces on short and long-term scales. in the past 150 years, human activities have resulted in significant changes in many aspects of earth’s environment, including increases in greenhouse gas concentrations, modifications of the nitrogen and phosphorous cycle and major alterations of land use (e. g., deforestation). it is crucial that we understand the interaction of human-caused alterations and natural changes to predict future changes in the earth’s environment. in turn, this information will assist sustainable development in relation to human activities while minimizing degradation of the environment and limiting the vulnerability of society to climate change.