British Prime Minister David Cameron speaks during a news conference on the final day of the G20 Leaders' Summit in Brisbane, Australia, on Nov. 16. (William West/AFP/Getty Images)

In a starkly downbeat assessment, British Prime Minister David Cameron has written that the world’s economy could be headed for another fall.

“Six years on from the financial crash that brought the world to its knees, red warning lights are once again flashing on the dashboard of the global economy,” Cameron writes in a piece published Monday in Britain’s Guardian newspaper.

The prime minister cites a euro-zone economy that is “teetering on the brink of a possible third recession, with high unemployment, falling growth and the real risk of falling prices too.” He also references emerging market economies that “were the driver of growth in the early stages of the recovery” but are now slowing, as well as stalled trade talks, instability in the Middle East, war in Ukraine and the spread of Ebola.

The bleak prognosis comes at the end of the Group of 20 summit in Brisbane, Australia, where leaders of the world’s biggest economies struggled with strategies for kick-starting growth.

Others have issued similarly negative pronouncements in recent days, particularly with relation to Europe. Mark Carney, the governor of the Bank of England, told reporters in London last week that “a specter is now haunting Europe — the specter of economic stagnation.”

But Europe is hardly the only sick patient. Government figures released Monday in Japan showed that the world’s third-largest economy has unexpectedly fallen back into recession, with GDP shrinking by 1.6 percent for the quarter.

Cameron’s decision to issue his warning may be motivated, at least in part, by domestic political challenges. He will face voters in less than six months, and Britain’s economic recovery since he took office amid a recession in 2010 is at the core of his campaign for another five years in office.

By forecasting gloom for the globe, Cameron may be helping to manage expectations for a scenario in which Britain’s economy also begins to flag.

The British economy has been relatively robust this year, especially compared with much of continental Europe. In his Guardian piece, Cameron deems Britain the fastest-growing economy in the Group of Seven, with official forecasts of 3.5 percent growth for 2014.

But a revival in growth figures has not been enough to give him a lead in the polls. In most surveys, Cameron’s Conservatives are running just behind the Labor Party, led by Ed Miliband, despite polls showing Miliband to be one of the most unpopular major-party leaders in modern times.

Labor has argued that despite economic growth and falling unemployment, wages have stagnated and the benefits of recovery have been concentrated too heavily among the country’s wealthiest.

Cameron used Monday’s opinion piece to argue that Britain needs to stay the course, with a call for continuing austerity policies aimed at taming the deficit — although he also touts major investments in roads and rail systems.

“We cannot insulate ourselves completely, but we must do all we can to protect ourselves from a global downturn,” Cameron writes. “Working through the agenda at the G-20, it was clearer than ever how vital it is that we stick to our long-term plan.”