Sentences level: difficult :D someone can help me please ! - According to the Gaia hypothesis, the earth is a self-regulating system whose components interact. - Can we say that everyone feels concerned by the environmental protection and sustainable development? - Few animals species have already disappeared and others are threatened and endangered. - Although environmentalists and economists are often (at loggerheads or completely disagree), they all claim to have designed the well-being of humanity. - As consumers become aware of environmental problems, they increasingly pressure on companies to inject more 'sustainability' in their strategies.