This lecture covers the environmental impacts of human activities, such as climate change, acid rain, air pollution, water scarcity, ozone depletion, fossil fuel depletion, deforestation, biodiversity loss, and their effects on human health, ecosystems, and ecosystem services. It also discusses the comparison between electric and conventional vehicles in the context of Quebec, the concept of shifting impacts in the life cycle perspective, and the importance of life cycle analysis in assessing environmental impacts and improving products and services.