A.I. Explanation:

Correct answer: emit

Explanation: The verb 'emit' fits grammatically as it describes the action of releasing carbon, which is the main subject of the sentence. It aligns contextually with the topic of carbon emissions and the urgency of climate change, making it the most appropriate choice.

Meaning: 'Emit' means to release or discharge something, particularly gases or substances, which in this context refers to carbon emissions contributing to global warming.

Wrong options:

• summit: Summit refers to the highest point or peak, which does not relate to the action of releasing carbon.
• admit: Admit means to confess or acknowledge something, which is not relevant to the context of carbon emissions.
• commit: Commit implies a promise or dedication to a cause, but does not convey the action of releasing carbon.

Correct answer: nowhere

Explanation: The word 'nowhere' indicates a lack of proximity to the ambitious goals needed for emissions cuts, fitting grammatically and contextually within the sentence structure, emphasizing the insufficiency of current plans.

Meaning: 'Nowhere' means not in any place or not at all, highlighting that the submitted climate plans are far from being adequate.

Wrong options:

• elsewhere: Elsewhere suggests a different location, which does not fit the context of assessing the ambition of climate plans.
• anywhere: Anywhere implies any location, which does not convey the intended meaning of insufficiency in this context.
• everywhere: Everywhere suggests a universal presence, which contradicts the idea of the plans being inadequate.

Correct answer: trajectory

Explanation: The noun 'trajectory' fits grammatically as it refers to the path or course of something, in this case, the planet's temperature increase. It aligns contextually with the discussion of climate change and future predictions.

Meaning: 'Trajectory' refers to the path followed by a projectile or an object in motion, here indicating the expected rise in temperature over time.

Wrong options:

• introductory: Introductory relates to the beginning of something, which does not apply to the ongoing climate situation.
• intimidatory: Intimidatory means causing fear or apprehension, which is not relevant to the context of temperature changes.
• articulatory: Articulatory pertains to speech or the production of sounds, which is unrelated to the topic of climate change.

Correct answer: blasting

Explanation: The verb 'blasting' fits grammatically as it describes the action of exceeding a limit, and contextually it emphasizes the severity of surpassing the 2°C threshold, making it a strong choice for the sentence.

Meaning: 'Blasting' means to move forcefully or rapidly, in this context indicating the alarming rate at which temperatures could exceed the set threshold.

Wrong options:

• broadcasting: Broadcasting refers to transmitting information, which does not fit the context of temperature exceeding limits.
• nominating: Nominating means to propose or suggest, which is irrelevant to the action of temperature increase.
• differentiating: Differentiating means to recognize or ascertain what makes something different, which does not apply to the context of temperature.

Correct answer: trigger

Explanation: The verb 'trigger' fits grammatically as it indicates causing something to happen, and contextually it aligns with the potential consequences of climate change, making it the most suitable choice.

Meaning: 'Trigger' means to cause something to start or happen, in this case, referring to the potential onset of tipping points in climate change.

Wrong options:

• elate: Elate means to make someone ecstatically happy, which does not relate to the serious consequences of climate change.
• oversize: Oversize refers to something being larger than usual, which is not relevant to the context of climate impacts.
• downsize: Downsize means to reduce in size or number, which contradicts the idea of triggering significant climate events.