The rising cost of a college education has contributed to the millennial generation being burdened with approximately $1 trillion in debt — and Democratic presidential candidates are offering their own policy solutions to offset the cost of college.

In April, Sen. Elizabeth Warren of Massachusetts introduced an ambitious $1.25 trillion plan to forgive most existing student loan debt and provide universal free college, paid for by a tax on the wealthiest Americans.

Other candidates, like Reps. John Delaney, Seth Moulton and Sen. Kirsten Gillibrand, have proposed student debt forgiveness or subsidized college for students who go into national service.

While the GI bill subsidizes varying amounts of college tuition and other education-related expenses for military veterans, the Pentagon has recently reported that just 29% of young Americans are able to meet the requirements to enlist in the military in the first place.

Read more: American millennials are saddled with more than $1 trillion in debt — and student loans make up the biggest share

Despite President Donald Trump recently proclaiming he would address student debt, calling himself "very good on loans," his administration's newly-proposed 2020 budget would phase out a Bush-era program that created partial student-loan forgiveness for students who participated in national service and work in the government or non-profit sector, as PBS recently noted.

To help open up access to college while also combatting the growing mountain of student debt, 2020 candidates are putting forward plans to increase alternative national service — and tying it to the issue of student debt.

"I'm incredibly pleased to see this issue getting attention at this point in the cycle, and I'm excited to see candidates recognize college affordability as an urgent matter that demands national attention," Kestrel Linder, the CEO of GiveCampus, a startup that helps K-12 schools and colleges and universities raise money from alumni and other donors, told INSIDER in an April phone interview.

"We have to do something, and we have to do something big, we can't make just incremental change right now," he added, noting that education is one of the most powerful drivers of economic and social mobility. "I don't think anyone can refute that making affordable college a reality would confer great benefits on our economy and society."

Here's a rundown of some of the presidential hopefuls' proposals.