Tree planting can be done in very different ways – a common way is large-scale monoculture plantation of exotic species, as this is cheap and efficient for carbon sequestration. However, planting only one tree species have been shown to be a threat to both local people and their environments, reducing biodiversity and availability of locally used trees. Local wildlife or insects may not be used to exotic trees and loss of pollinators may affect agriculture. People often need to leave their land to make space for large plantations, or are restricted from accessing the area afterwards, and monocultures require more agricultural inputs such as pesticides and fertilizers. Tree restoration initiatives, or agroforestry-based tree planting where a few trees are planted and often mixed with agricultural practices, can have very different impacts locally – farmers may have more decision-making power over what trees are planted and where. The risk of rural people losing land is usually smaller. However, these projects can still have problematic aspects and impacts in other aspects discussed in this guide.