As the pandemic made its mark in 2022, the planet _________(25)_________ a series of growing environmental challenges. At the UN, the struggles of farmers and the global food system, the ________ (26)_________ loss of biodiversity, and the ever-heating planet dominated the agenda, culminating at November’s COP26 climate conference. This challenge is especially ______ (27)______ in India, where more than 700 million people depend on forests and agriculture for their sustenance. More than 85% of them are small and marginal landholders, leaving them especially _________ (28)_________ as the climate changes the world around them. Fortunately, pioneers across India are deploying a set of techniques, known as landscape restoration, that can _______(29)______ damaged ecosystems and ______(30)____ biodiversity.

(30)

The correct answer is improve.

Step-by-Step Explanation:

1. Analyze the Context:
The given passage discusses environmental challenges and positive efforts being made to address them. The sentence in question states: "Fortunately, pioneers across India are deploying a set of techniques, known as landscape restoration, that can _______(29)______ damaged ecosystems and ______(30)____ biodiversity."

2. Identify the Target Blank (30):
The blank (30) is paired with "biodiversity" as a direct object of the verb. The action described should align with the positive context established by "Fortunately" and "landscape restoration." Restoration efforts aim to increase, enhance, or upgrade natural habitats and biodiversity.

3. Evaluate the Options:
• improve: Means to make or become better, enhance, or increase in quality/quantity. Enhancing or improving biodiversity fits naturally with landscape restoration efforts.
• rectify: Means to put right or correct a mistake or error. One rectifies a problem or mistake, not biodiversity itself.
• resolve: Means to settle or find a solution to a problem/conflict. Like "rectify," you resolve an issue, not biodiversity.
• disapprove: Means to have or express a unfavorable opinion, which has a negative meaning and is completely contextually inappropriate.
• engage: Means to occupy, attract, or involve. It does not collocate well with biodiversity in this context.

4. Conclusion:
The word improve logically and grammatically completes the phrase "...can restore damaged ecosystems and improve biodiversity."