The conservation movement, also known as nature conservation, is a political, environmental, and social movement that seeks to manage and protect natural resources, including animal, fungus, and plant species as well as their habitat for the future. Conservationists are concerned with leaving the environment in a better state than the condition they found it in. Evidence-based conservation seeks to use high quality scientific evidence to make conservation efforts more effective.

The early conservation movement evolved out of necessity to maintain natural resources such as fisheries, wildlife management, water, soil, as well as conservation and sustainable forestry. The contemporary conservation movement has broadened from the early movement's emphasis on use of sustainable yield of natural resources and preservation of wilderness areas to include preservation of biodiversity. Some say the conservation movement is part of the broader and more far-reaching environmental movement, while others argue that they differ both in ideology and practice. Conservation is seen as differing from environmentalism and it is generally a conservative school of thought which aims to preserve natural resources expressly for their continued sustainable use by humans.

The conservation movement can be traced back to John Evelyn's work Sylva, which was presented as a paper to the Royal Society in 1662. Published as a book two years later, it was one of the most highly influential texts on forestry ever published. Timber resources in England were becoming dangerously depleted at the time, and Evelyn advocated the importance of conserving the forests by managing the rate of depletion and ensuring that the cut down trees get replenished.

Khejarli massacre:

The Bishnoi narrate the story of Amrita Devi, a member of the sect who inspired as many as 363 other Bishnois to go to their deaths in protest of the cutting down of Khejri trees on 12 September 1730. The Maharaja of Jodhpur, Abhay Singh, requiring wood for the construction of a new palace, sent soldiers to cut trees in the village of Khejarli, which was called Jehnad at that time. Noticing their actions, Amrita Devi hugged a tree in an attempt to stop them. Her family then adopted the same strategy, as did other local people when the news spread. She told the soldiers that she considered their actions to be an insult to her faith and that she was prepared to die to save the trees. The soldiers did indeed kill her and others until Abhay Singh was informed of what was going on and intervened to stop the massacre. Some of the 363 Bishnois who were killed protecting the trees were buried in Khejarli, where a simple grave with four pillars was erected. Every year, in September, i.e., Shukla Dashmi of Bhadrapad (Hindi month) the Bishnois assemble there to commemorate the sacrifice made by their people to preserve the trees.

The field developed during the 18th century, especially in Prussia and France where scientific forestry methods were developed. These methods were first applied rigorously in British India from the early 19th century. The government was interested in the use of forest produce and began managing the forests with measures to reduce the risk of wildfire in order to protect the "household" of nature, as it was then termed. This early ecological idea was in order to preserve the growth of delicate teak trees, which was an important resource for the Royal Navy.

Concerns over teak depletion were raised as early as 1799 and 1805 when the Navy was undergoing a massive expansion during the Napoleonic Wars; this pressure led to the first formal conservation Act, which prohibited the felling of small teak trees. The first forestry officer was appointed in 1806 to regulate and preserve the trees necessary for shipbuilding.

This promising start received a setback in the 1820s and 30s, when laissez-faire economics and complaints from private landowners brought these early conservation attempts to an end.