In Colombia, Drilling Pays the Bills. The Country’s Leaders Want to Quit Oil.

ARAUCA, Colombia — Over the past four decades, Colombia has pumped billions of barrels of oil from under a vast savanna it shares with neighboring Venezuela. Through pipelines, the thick crude travels over the Andes and to the Caribbean coast, and then onto tankers, mostly to the United States.

Much like another famous export of Colombia’s, it has an addictive quality.

In the span of a generation, the nation’s economy became dependent on oil revenue.

This year, voters moved to break that habit, electing Colombia’s first leftist president in two centuries of independence, a former guerrilla fighter and environmentalist who wants to phase out oil while heavily taxing coal mining companies.

“What is more poisonous for humanity: cocaine, coal or oil?” President Gustavo Petro asked world leaders at the United Nations General Assembly in September. “The opinion of power has ordered that cocaine is poison,” he said. “But instead, coal and oil must be protected, even when it can extinguish all humanity.”

Mr. Petro, 62, is at the vanguard of a new crop of climate-conscious Latin American leaders. South America and Central America’s political pendulum has swung left once again, but instead of arguing that extractive economies are needed to fund welfare programs, as many of their socialist contemporaries and predecessors have, Mr. Petro, President Gabriel Boric of Chile and others say fossil fuels have not lifted enough people out of poverty to justify their impact on the climate.

It is a radical proposition, if only because Colombia is still relatively poor and theoretically has decades more of oil revenue to reap. That money now accounts for around a fifth of government income, roughly half of its foreign investment and nearly a 10th of gross domestic product.

Colombia would be the first major oil producing country in the world to stop drilling if Mr. Petro successfully decoupled the national budget from oil money. On the opening day of the U.N. climate talks in Sharm el Sheikh, Egypt, Mr. Petro doubled down on his promise.

“Surmounting the climate crisis means leaving behind the consumption of oil and coal,” he told leaders from nearly 200 nations. “This means a profound transformation of economies, a devaluing of powerful interests in these economies, a change in the global economy that the political leadership of humanity cannot get ahead of.”

His environment and energy ministers, both women with backgrounds as activists, have been assigned the task of reimagining Colombia’s economy without it.

“Because of our dependence on fossil fuels, we’ve set up the economy to fail if we don’t change it,” Susana Muhamad, the environment minister, said. “We haven’t made a major new oil discovery in years. Besides that, you cannot ignore climate change. That is the whole point.”

The government, which has been in power for only three months, has asked for six more months to come up with the particulars of its energy transition. The big question is: What will replace Colombia’s oil revenue? Even tentative details are sketchy.

The uncertainty has already made many wary of Mr. Petro’s vision. In his campaign, he promised to end new permits for oil exploration and impose a windfall tax on oil and coal companies.

The concern is mostly economic, as Colombia already generates nearly 80 percent of its energy from renewable sources — mainly hydropower.

The country’s business elite, many of whom are invested in the oil industry, are watching as Colombia’s already weak currency dips further, reacting to Mr. Petro’s policy proposals, soaring energy prices and global inflation.

“We have to reduce our dependence on fossil fuels, yes, but imagine choosing this very moment to do it,” said Óscar Iván Zuluaga, Colombia’s long-serving finance minister, now a businessman in steel-making, an industry that contributes between 7 and 9 percent of greenhouse gas emissions globally. “Petro has to take reality into account, not just ideology. That is the basis of governance.”

The specter of economic collapse in Venezuela, where government mismanagement has plunged the economy into free-fall, shadows Mr. Petro’s plans. More than two million Venezuelans have settled in Colombia in recent years, fleeing destitution.

“With Petro, we can also descend into total chaos,” said Erik Arciniegas, who runs a contracting company that services oil companies in Arauca, where two-thirds of the vote went to Mr. Petro’s opponent.

Mr. Arciniegas stands to lose business under Mr. Petro, but his argument against phasing out oil mirrors one that has gained traction across the developing world.

“The Americans and the Arabs are continuing to benefit from those riches,” he said. “I don’t understand why we should stop.”

That view is shared by the leftist leaders of Latin America’s two biggest economies, Brazil and Mexico, which each produce more oil than Colombia. At the climate summit in Egypt, Colombia’s delegation has tried to rally Latin American counterparts to forge regional consensus on “decarbonization” but so far have little to show for it.

In Brazil, environmentalists claimed a win with last month’s election victory of Luiz Inácio Lula da Silva, commonly known as Lula, who has a record of clamping down on deforestation. But few see him making similar moves to Mr. Petro.

When asked about Mr. Petro’s oil phase-out plans during the election, Mr. Lula told reporters: “In the case of Brazil, it is not a real possibility. Nor in the case of the world.”

Mr. Lula is expected to receive a warm welcome this week in Sharm el Sheikh, where he will give a speech and hold discussions focused on protecting the Amazon rainforest. About 10 percent of the Amazon is in Colombia, and deforestation is far less rampant there than in Brazil.

Regional climate aspirations suffered a setback in October, when voters rejected a constitutional referendum in Chile that would have incorporated climate considerations into almost every aspect of governance.

“I’ve known Petro for 16 years, and since the beginning, he has criticized the Latin American left on their dependence on commodities,” Ms. Muhamad said. “He is very clear that because of climate change, more and more of governance will be about crisis management. The more we can prevent crises, the more we can move forward.”

Colombia has begun to experience more frequent effects of climate change as its glaciers melt and as La Niña and El Niño weather patterns become less predictable, exposing much of the country’s coast to cycles of flood and drought.

Ms. Muhamad, 45, once worked for Shell, one of the world’s biggest oil companies, as an environmental and human rights risk consultant. She grew disillusioned when she realized her self-described “ecotopian” vision of helping Shell transition to energy sources beyond oil and gas was unlikely.

She and her colleague, the energy and mining minister Irene Vélez, 40, both spent much of the last couple of decades working with marginalized communities.

“I call myself an activist scholar,” Ms. Vélez said. She earned a doctorate focused on miners of Afro-Colombian descent and taught a university course on extractive economies before becoming minister. “One of the things I have brought to government is a good understanding of the real problems that people face, and the confidence that what we’re trying to solve is important,” she said.

The two ministers see their proposed energy transition as a “gran giro,” or a great turn, that would gradually eliminate oil and coal and reorient Colombia’s export economy around ecotourism and producing foodstuffs like grain and avocados.

In interviews, neither Ms. Muhamad nor Ms. Vélez nor Mr. Petro’s vice president, Francia Márquez, would fully recommit to the campaign pledge of stopping new oil permits, instead saying that consultations on that plan were still underway. After protests organized in part by oil companies, Mr. Petro tweeted reassurances that oil production and exploration were still “continuing normally.”

“There is no prohibition,” he wrote.

Climate activists are holding on to hope that Mr. Petro will follow through on his promises.

“I’m not naïve, but I am excited,” Maria Laura Rojas, a co-founder of the environmental organization Transforma, said. “He won’t be able to do everything in a four-year term. But mainstreaming environment and life, that’s new. Colombia should be a laboratory for Latin America’s energy transition, and Latin America for the world’s.”

Even Mr. Petro’s opponents mostly wish him well.

At a protest in Arauca spearheaded by Mr. Arciniegas, the contractor, there were no denunciations of Mr. Petro, and the chants felt more like gentle suggestions.

“La reforma sí, pero no así,” went one. “Yes to reform, but not in this form.”

In the airy halls of the business district of the capital, Bogotá, executives who were open about not voting for Mr. Petro nevertheless praised his intelligence and oratory skills.

In explaining his support for Mr. Petro’s energy transition plans, Bruce MacMaster, the president of the National Business Association, pulled out a copy of a presentation he made at last year’s climate summit in Glasgow, detailing a plan for Colombia’s low-carbon future.

“When he talks about climate, and cocaine, we are with him. We have also put our lives into these fights,” Mr. MacMaster said. “But move away from fossil fuels too fast and Petro will lose everything: people’s faith, foreign investment, the strength of our currency.”

It would be better, he said, if Mr. Petro convinced the major industrial nations that buy Colombia’s oil and emit many times as much carbon dioxide to change their ways first.

“The United States, Europe, China, India — the future of the world depends on their leadership,” Mr. MacMaster said. “May Petro be their prophet. God knows we have lacked one on this issue.”

Genevieve Glatsky, Julie Turkewitz and Federico Rios contributed reporting.