[bear globe on fire] Economists at Citi are still pretty worried about a global recession. Now, Citi defines global recession as GDP growth less than 2% globally. Which while maybe not fitting a recession definition that requires a contraction in economic output, is still pretty disappointing when you consider that for all of its problems, China — the world's second-largest economy — is set to grow more than 6% this year. (And I mean, sure, that's sort of the whole point: is China really growing at that pace?) Anyway, here's the case from a note Thursday out of Citi's economics team led by Ebrahim Rahbari, Willem Buiter, and Cesar Rojas (emphasis ours): WE BELIEVE THAT WE ARE CURRENTLY IN A HIGHLY PRECARIOUS ENVIRONMENT FOR GLOBAL GROWTH AND ASSET MARKETS AFTER 2-3 YEARS OF RELATIVE CALM. The most recent deterioration in the global outlook is due to a moderate worsening in the prospects for the advanced economies (AE), a large increase in the uncertainty about the AE outlook (notably for the US) and a tightening in financial conditions everywhere. Unlike most of the previous years, the most recent worsening in global growth prospects and global sentiment is therefore driven by the advanced economies rather than EM. THE GROWING THREAT TO THE GLOBAL OUTLOOK RESTS ON POOR FUNDAMENTALS, WHICH INCLUDE THE PRE-EXISTING FRAGILITIES RELATED TO THE STRUCTURAL AND CYCLICAL SLOWDOWNS IN CHINA AND ITS UNSUSTAINABLE CURRENCY REGIME, BROKEN [EMERGING MARKET] GROWTH MODELS, EXCESSIVE LEVERAGE ACROSS MANY COUNTRIES AND SECTORS, AND RISING REGIONAL RISKS (BREXIT) AND GEOPOLITICAL RISKS (INCLUDING IN RUSSIA, TURKEY AND SYRIA, THE SOUTH CHINA SEA, AND NORTH KOREA). These fundamental concerns are aggravated by a crisis of confidence that is in part fueled by a growing worry that, should conditions deteriorate, they may not elicit an effective policy response. The main ‘game changers’ in our view are the emerging belief that even the US economy is no longer bullet-proof and that policymakers (in the US and elsewhere) may not be there to come to the rescue of their own economies, let alone the world economy, by propping up asset prices and aggregate demand. IT IS LIKELY, IN OUR VIEW, THAT GLOBAL GROWTH WILL THIS YEAR ONCE AGAIN UNDERPERFORM (AGAINST LONG-TERM TRENDS AND PREVIOUS YEAR FORECASTS). CITI'S LATEST FORECASTS ARE FOR GLOBAL GROWTH OF 2.5% IN 2016 (BASED ON MARKET EXCHANGE RATES AND OFFICIAL STATISTICS) AND AROUND 2.2% (ADJUSTED FOR PROBABLE CHINESE MISMEASUREMENT). BUT IN OUR VIEW, THE RISK OF A GLOBAL GROWTH RECESSION (GROWTH BELOW 2%) IS HIGH AND RISING. So that's basically the whole laundry list of reasons to be worried about the global economy. And what stands out to us is Citi's contention that even a minor issue in the US economy could sink the whole thing. Citi again (and again, our emphasis): A MATERIAL SLOWDOWN IN THE US, EVEN SHORT OF A RECESSION, WOULD STILL BE A MAJOR HEADWIND FOR THE WORLD ECONOMY: AT THIS POINT, IT COULD MAKE A GLOBAL RECESSION ACCORDING TO OUR DEFINITION ALMOST UNAVOIDABLE. The damage to global growth conditions would come from three sources: deteriorating financial conditions globally, weaker demand from the US and weakening (consumer and business) sentiment more broadly (through contagion). And while economic growth in the US certainly slowed into the end of 2015, news from the economy in 2016 has been less bad, if still mixed. On Wednesday, for example, we got some very discouraging news about growth in the services sector 0f the economy — which accounts for about 85% of GDP. This, however, was bookended by positive housing data out Tuesday morning and a solid labor market reading out Thursday morning. Expect this debate to continue. SEE ALSO: PAUL KRUGMAN ON GREECE, EUROPE, BREXIT, THE US ELECTION, AND MONETARY POLICY Join the conversation about this story » NOW WATCH: There's something unsettling about these photos from NASA's Curiosity Mars rover