The protocol amended in 1990 to protect the Ozone layer by completely phasing out CFC is :

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AKyoto Protocol

BCartagena Protocol

CStockholm Convention

DMontreal Protocol

Answer:

The original Montreal Protocol, signed in 1987, was the first step in international efforts to protect stratospheric ozone.
The London Amendment (1990) changed the ozone-depleting substances emission schedule by requiring the complete phaseout of CFCs, halons, and carbon tetrachloride by 2000 in developed countries, and by 2010 in developing countries.
Methyl chloroform was also added to the list of controlled ozone-depleting substances, with phaseout in developed countries targeted in 2005, and in 2015 for developing countries.

Related Questions:

Which of the following statements regarding the pre-disaster stage is NOT correct?

The primary goal of prevention in the pre-disaster stage is to minimize the damage after a disaster has struck.
Pre-disaster activities are typically undertaken after a disaster to assess the damage and provide aid.
Creating disaster-resilient structures and communities is a primary focus of pre-disaster activities.
Mitigation focuses on entirely avoiding the occurrence of a disaster, regardless of its nature.

Which of the following statements inaccurately describes an aspect of Community Based Disaster Management (CBDM) Plans?

A CBDM plan is solely focused on post-disaster recovery and rehabilitation efforts, neglecting pre-disaster preparedness.
The implementation of an effective warning system is critical for timely communication of potential hazards to the community.
Formation of disaster management committees and teams helps in structuring and organizing local response efforts.
CBDM emphasizes a top-down approach where central authorities dictate all disaster management activities to local communities.