Which of the following is a goal of the Navy's energy policy by 2020?

The Navy's energy policy set a goal to obtain 50% of its energy from alternative sources by the year 2020. This initiative reflects a broader commitment to enhancing energy security and sustainability within the Navy's operations. The shift towards alternative energy sources is crucial to reduce reliance on traditional fossil fuels and to address environmental concerns.

The focus on 50% is significant because it represents a measurable target that can guide the Navy's strategic planning and investments in renewable energy technologies. This goal aligns with the Navy's broader objectives of operational readiness, cost-effectiveness, and environmental stewardship, as well as supporting the national strategic imperative for energy independence.

The other options, such as 100% from alternative sources or zero waste on Navy ships, are either overly ambitious or not specifically aligned with the established goals for that time frame. While reducing petroleum usage and waste management are important, the explicit aim for 2020 was centered on achieving 50% usage from alternative energy sources, making this a realistic and tangible goal for Navy operations.