Bulwark

Bulwark
- Someone or something that protects or defends something such as a belief, idea, or way of life

Wood bulwark against neighbor's pets.
Image Credits : Alexandre Gallier 

Usage:
- Scientists say the vast amazon rain-forest is a bulwark against global warming, as its lush vegetation absorbs heat-trapping carbon dioxide from the atmosphere.
- Private consumption growth — the bulwark of India's growth story in recent years.

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