On 6 December 2024, after a negotiation marathon that spanned five European Commission presidencies, four Brazilian governments, multiple Argentine administrations, and countless collapsed deadlines, the European Union and the four founding members of Mercosur — Argentina, Brazil, Paraguay and Uruguay — finally shook hands on a comprehensive trade and partnership agreement.

The agreement is historic in scale. It creates the world's largest free-trade zone by population, covering roughly 25% of global GDP. For European exporters — of cars, machinery, pharmaceuticals, wine and cheese — it promises tariff cuts worth more than €4 billion a year. For South American producers of beef, soy, sugar and ethanol, it unlocks preferential access to a wealthy market of 450 million consumers. And for strategists on both sides of the Atlantic, it offers a geopolitical anchor at a moment when US tariffs and Chinese influence are reshaping global trade.

But the deal arrives burdened with controversy, and its path to full ratification remains filled with obstacles.

What the deal actually does

At its core, the EU–Mercosur Partnership Agreement (EMPA) is a mutual tariff-dismantling exercise phased in over 15 years. Mercosur will progressively eliminate duties on European cars (currently up to 35%), machinery, chemicals and pharmaceuticals. The EU will remove tariffs on 92% of Mercosur exports, with beef, poultry, sugar, rice and honey managed through carefully calibrated quotas and safeguard mechanisms.

Beyond tariffs, the agreement covers government procurement — giving EU companies access to Brazil's federal contracting market, which alone exceeds €8 billion a year — as well as intellectual property protection, digital trade, and investment facilitation. Some 357 European geographical indications, from Prosciutto di Parma to Roquefort, will be legally protected from imitation across South America.

There is also a strategic dimension that has grown more prominent as the deal has aged. The EU imports 82% of its Niobium — a critical mineral used in superconducting magnets for MRI scanners and cancer treatment — from Mercosur. Securing sustainable access to such materials, while reducing dependence on China, has become a core argument for proponents.

The agricultural battleground

No issue has been more explosive than agriculture. French farmers — joined by colleagues from Greece, Ireland and elsewhere — have mounted some of the most dramatic protests seen in Brussels in years, hurling produce at parliament buildings and clashing with police outside EU summits. Their grievance is structural: they operate under some of the world's strictest environmental, animal welfare and food safety regulations, and they see the deal as opening their market to competitors who play by different rules.

The Commission has gone to considerable lengths to address these concerns. Beef imports from Mercosur will be capped at 99,000 tonnes — just 1.5% of EU annual production and below current import levels. Poultry quotas are similarly limited. A €6.3 billion safety-net fund will compensate farmers if market disturbances occur. Import triggers can suspend trade if volumes rise sharply. Italy, which had wavered, was ultimately won over by these concessions. France and Poland were not.

Critics argue the safeguard mechanisms are set so high they would rarely, if ever, activate. Labour unions representing food sector workers note that all Mercosur countries except Uruguay regularly violate ILO conventions on collective bargaining and freedom of association — meaning European products compete not just against different environmental rules, but against different labour cost structures too.

The environmental question

The deal's most globally significant controversy is deforestation. In the Amazon, cattle graze on 63% of all cleared land. Half the agricultural products Brazil ships to the EU can be linked to deforestation. The French government's own impact assessment calculated that expanded beef access could increase deforestation by at least 5% a year over a six-year period — a figure environmentalists cite relentlessly.

The Commission responds that the agreement includes binding commitments on climate, the Paris Agreement, and sustainable development, and that — crucially — from the end of 2026 onward, the EU Deforestation Regulation will bar entry of any products linked to cleared land, including soy, beef, palm oil and coffee. Greenpeace and allied NGOs counter that the regulation is already being delayed and weakened, and that the trade agreement's sustainability clauses lack enforceable mechanisms.

A further dimension, less discussed but pointed out by critics, is the so-called "boomerang pesticide" problem: chemicals banned for agricultural use within the EU, still manufactured there for export to Mercosur, then returning to European consumers as residues in imported food.

What happens next

The Interim Trade Agreement entered provisional application on 1 May 2026 — but this is only the beginning of a long ratification process. The full EU–Mercosur Partnership Agreement requires the consent of the European Parliament, and then ratification by all 27 EU member states individually. In January 2026, the Parliament voted 334–324 to ask the European Court of Justice whether the deal is compatible with EU law — a referral that could delay implementation by up to two years.

In South America, Mercosur governments must also ratify the deal through their own legislative processes. Bolivia, which joined Mercosur in July 2024, is not a party to the agreement at all, as negotiations concluded before its accession.

If all hurdles are cleared, the changes will be phased in over 15 years. The question of whether that will happen — and whether the deal's promises outweigh its risks — will be argued in parliaments, courtrooms and farm fields for years to come. What is no longer in question is that, after a quarter century, the two blocs have chosen to tie their fortunes together. Whether that bet pays off depends less on the text of the agreement than on the political will to make it work…