This chapter looks at ‘environmental gentrification’, also called ecological gentrification or green gentrification, and how it leads to the marginalization, exclusion, or displacement of vulnerable residents and community members as a result of sustainability planning or urban greening efforts. A mainstream perception is that sustainability and greening initiatives provide benefits to all residents across the city, and further, that they will address environmental justice concerns by benefitting those who have suffered the greatest environmental burdens. This chapter argues otherwise and shows how these initiatives tend to raise property values and attract wealthier and whiter residents. Low-income residents, homeless residents, tenants in informal housing, and people of colour have found themselves excluded from the benefits of these new environmental amenities and vulnerable to unintended, yet negative, consequences, such as residential, commercial, or industrial displacement. The chapter also looks at how communities and residents are addressing this dilemma in urban greening and sustainability.