Main factors that destroy plants are-
(i) Cutting of trees- For agriculture, wood, urbanisation.
(ii) Pollution- Air, water, soil pollution.
(iii) Climate change-Drought, flood and increased temperature.
(iv) Pests and diseases-Fungal/Bacterial infections and insect attacks.
(v) Human carelessness-Overgrazing, fire, wastes etc.
(vi) Invasive species-Harmful for local plants.
(vii) Encroachment of land-It is done for construction activities.