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Explanation: D4D is the practice of designing spacecraft components to burn up completely upon atmospheric re-entry, leaving no harmful debris. Implementing Agencies: Spacecraft designers, regulatory bodies enforcing space sustainability.

Explanation: These are devices designed to increase the atmospheric drag on satellites and debris, hastening their de-orbiting process. Implementing Agencies: Satellite operators, space technology development companies.

Explanation: ADR involves the development and deployment of technologies to remove existing large debris from orbit. Implementing Agencies: Government space agencies, private companies specializing in space debris removal.

Explanation: PMD requires decommissioned satellites to be responsibly disposed of by moving them to a graveyard orbit or ensuring atmospheric re-entry within 25 years. Implementing Agencies: Space agencies, satellite operators.

Explanation: Debris shielding entails fortifying satellites and spacecraft with protective shields to mitigate the effects of impacts with small debris. Implementing Agencies: Aerospace manufacturers, International Space Station partners.

Explanation: Passivation is the process of depleting spacecraft and rocket stages of residual energy (fuel, battery power) to reduce the risk of explosions. Implementing Agencies: Satellite manufacturers, launch service providers.

Explanation: Collision Avoidance strategies involve the use of tracking systems and maneuverable spacecraft to avoid potential collisions with debris. Implementing Agencies: Satellite operators, Space surveillance networks.

Explanation: This strategy involves physically capturing debris with tethered nets or harpoons and then dragging it down to burn up in the Earth's atmosphere. Implementing Agencies: Space agencies, commercial organizations developing ADR technologies.

Explanation: Laser ablation involves using ground-based or space-based lasers to vaporize or alter the trajectory of debris. Implementing Agencies: High-energy laser research organizations, space defense entities.