Step 1: Meaning.
Environmental movements are mass protests or organized efforts to conserve nature and resist ecological destruction.
Step 2: Features.
\begin{itemize}
\item Focus on issues like deforestation, pollution, and climate change.
\item Demand government policies for conservation.
\item Often led by local communities and activists.
\end{itemize}
Step 3: Examples.
\begin{itemize}
\item Chipko Movement (1970s) in Uttarakhand against deforestation.
\item Narmada Bachao Andolan for displacement and environment concerns.
\end{itemize}
Final Answer: \[ \boxed{\text{Environmental movement = organized effort to protect nature and resources}} \]