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Don't hold your breath, but future historians may look back on 2015 as the year that the renewable energy ascendancy began, the moment when the world started to move decisively away from its reliance on fossil fuels.

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The Anthem breach alone exposed 80 million Social Security numbers, and then was quickly followed by the Premera breach that exposed yet another 11 million Americans' SSNs. The question now: Why are we still using Social Security numbers to identify taxpayers?

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Hillary Clinton's campaign announcement is an insult to the presidency. It represents a total capitulation to the political consulting business -- two-and-a-half minutes of marketing images, without anything resembling serious argument.

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Wisconsin -- where workers have a deep and rich history of fighting for a voice on the job -- is the latest state to enact a law intended to sap them of their power and strength. With Gov. Scott Walker's signature, the right-to-work scam is now the law in Wisconsin.

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Americans deserve to know about a presidential prospect's health, and questions about experience and integrity are, of course, legitimate areas of inquiry. But to imply that Hillary -- or any candidate -- should be discounted based on advancing age goes too far. Age is an asset; it's no disqualifier.

It's about time we recognized that if you work for a living, you should be able to support your health and your family. American families simply aren't being supported today, but there's a simple solution to all of this: Congress must pass paid sick leave and paid family leave policies. We're sick of waiting.

How long can we expect to see new reports and videos of unarmed black men being shot by police in incidents all across the country? Aspects of two of the most recent shootings in Tulsa, Okla. and North Charleston, S.C., suggest some answers to the question, and the answers do not bode well.

Through a myriad of tax avoidance schemes, the wealthy 1 percent continue to profit using public resources, subsidies and infrastructure while the 99 percent disproportionately pay the bills for it -- all while struggling to pay their own bills, mortgages, student loans, and more. Americans must ask why individual taxpayers are fronting the money for hugely profitable corporations.

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Let's be clear. No American citizen should be denied housing, the ability to attend school, to apply for a mortgage, or to serve on a jury because of their sexual orientation or gender identity.

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On Tax Day, while working Americans contribute their part to keeping the country running, many companies that pay low-wages will exploit a loophole in the tax code that that allowed them to write off taxes on over $66 billion in executive compensation pay between 2007 and 2010.

Repealing the estate tax won't create jobs, it won't boost GDP and it won't add efficiency to the market. Instead, repealing the estate tax will simply add to the debt, hurt our ability to build a stronger economy and worsen economic inequality.

On one issue, though, there is a sizeable (and growing) bloc of voters who are not only cross-partisan but also so committed they could be called "single-issue voters." I'm speaking of the marijuana vote. And it could be up for grabs next year.

Who deserves a break more these days: a struggling working family, or the heir to a billion-dollar fortune? According to the Republican majority in the U.S. House of Representatives, it's the billion-dollar baby.

Our founding fathers were prescient in many ways, providing a system that had checks and balances designed to preserve liberty and ensure a peaceful and stable society. But the founding principle of this form of government is the consent of the governed. The gigantic role of money in our political system isn't what they had in mind.

Since the Citizens United Supreme Court ruling five years ago, the influx of big money in politics has distorted Washington's ability to represent the people's interests over corporate interests.

If we are going to ask our students to work hard and achieve the American Dream, we must do our part to ensure that they have the resources they need. We can start by investing in our schools.

In recent years, the U.S. has been involved in a variety of multinational interventions in Africa, including one in Libya that involved both a secret war and a conventional campaign of missiles and air strikes, assistance to French forces, and the training and funding of African proxies.