"integrity of the earth's life-support systems" was essential for sustainability.: 140 the authors said that "the sdgs fail to recognize that planetary, people and prosperity concerns are all part of one earth system, and that the protection of planetary integrity should not be a means to an end, but an end in itself".: 147 the aspect of environmental protection is not an explicit priority for the sdgs. this causes problems as it could encourage countries to give the environment less weight in their developmental plans.: 144 the authors state that "sustainability on a planetary scale is only achievable under an overarching planetary integrity goal that recognizes the biophysical limits of the planet".: 161 other frameworks bypass the compartmentalization of sustainability into separate dimensions completely. environmental sustainability the puerto rico sustainability & investment summit of 2022 and other global conferences bring about more discussion on sustainability. the environmental dimension is central to the overall concept of sustainability. people became more and more aware of environmental pollution in the 1960s and 1970s. this led to discussions of sustainability and sustainable development. this process began in the 1970s with concern for environmental issues. these included natural ecosystems or natural resources and human environment. it later extended to all systems that support life on earth, including human society.: 31 reducing these negative impacts on the environment would improve environmental sustainability.: 34 environmental pollution is not a new phenomenon. but it has been only a local or regional concern for most of human history. awareness of global environmental issues increased in the 20th century.: 5 the harmful effects and global spread of pesticides like ddt came under scrutiny in the 1960s. in the 1970s it emerged that chlorofluorocarbons (cfcs) were depleting the ozone layer. this led to the de facto ban of cfcs with the montreal protocol in 1987.: 146 in the early 20th century arrhenius discussed the effect of greenhouse gases on the climate. (