Missy Sims carefully picked her way through a field of ruined tombs in
central Puerto Rico, in a cemetery where walls of water from Hurricane
Maria had smashed open some coffins and sent others careering into a
nearby stream.

Six years later, the burial place in Lares, where more than 1,700 graves
were damaged, is still shattered.

�This is apocalyptic, end of the world, end of times stuff,� said Ms.
Sims, an attorney who is representing 16 Puerto Rican municipalities that
are seeking to hold the fossil fuel industry responsible for the damage
caused by a series of storms, including Maria.

Ms. Sims wiped away a tear as she surveyed the broken graves and absorbed
the pain of the grieving families. But she also vowed to hold those
responsible to account.

Ms. Sims, 54, may be the most surprising legal figure to emerge as the
world grapples with the devastating impacts of a warming planet. An
Armani-and-Rolex wearing observant Catholic from a small Midwest town who
talks to God as she mulls her complex legal cases, Ms. Sims is also a
constant TikTok poster whose dog has more followers than some celebrities.

And she is now the singular force behind a creative legal gambit to make
oil and gas companies pay for the devastation being wrought by climate
change in Puerto Rico. Her strategy is being carefully watched by the
fossil fuel industry and environmental groups as well as other lawyers and
municipalities.

The lawsuit she filed in November goes after a who�s who of the fossil
fuel industry � Exxon Mobil, Chevron, Royal Dutch Shell, BP and others.
Ms. Sims argues that since 1965, those companies have produced 40 percent
of global greenhouse gas emissions, while at the same time colluding to
deceive the public about the disastrous consequences of their actions.

The case is part of a new wave of litigation targeting oil, gas and coal
companies over climate change, which is driven by the burning of their
products. But it stands out in two significant ways.

It was the first to allege that, by downplaying the effects of global
warming for decades, the fossil fuel companies violated the Racketeer
Influenced and Corrupt Organizations Act, which was originally designed to
crack down on organized crime. So-called RICO charges expose the
defendants to potentially huge financial damages and open up a new front
in their growing legal challenges.

The case was also the first to request damages from a specific weather
event. In her 247-page complaint, Ms. Sims notes that scientific studies
have shown that man-made global warming made the 2017 hurricanes more
severe, causing Maria to rapidly intensify in a way that killed thousands
and inflicted more than $100 billion worth of destruction on Puerto Rico.
It was the worst storm to ever hit the island.

Exxon and ConocoPhillips declined to comment. In a statement, Shell said,
�We do not believe the courtroom is the right venue to address climate
change, but that smart policy from government and action from all sectors
is the appropriate way to reach solutions and drive progress.�

If the companies were found liable, the potential damages could run into
the hundreds of billions of dollars, legal experts say.

�That�s why the companies are so afraid of these cases,� said Richard
Wiles, president of the Center for Climate Integrity, a nonprofit
organization that is helping garner support for the Puerto Rico case. �If
they have to pay for the damages they caused, the costs get out of control
really fast.�

�God�s Work�
This isn�t the first time Ms. Sims has sued Exxon.

She got her start as an associate at a small-town firm in central Illinois
run by an accomplished municipal lawyer who would start each workday by
leading the office in prayer. That suited Ms. Sims.

�He didn�t try to cram it down anybody�s throat,� Ms. Sims said. �He
literally was just, �Hey, let�s do God�s work today.��

Ms. Sims soaked up local code and helped communities prosecute people who
wouldn�t clean up after their pets, residents who didn�t have their
trailers on foundations and landowners who wouldn�t cut their weeds.

After several years, the mayor of DePue, a tiny village on a lake in
northern Illinois, told Ms. Sims about a much more serious nuisance. A
former industrial site was polluting the community, and no one would clean
it up.

The site, a shuttered zinc smelting facility that once helped make film
for Hollywood, had closed in 1989. But hazardous amounts of lead, mercury,
cyanide, and cadmium remained in the ground. When it rained, puddles
turned bright blue from the heavy metals, and local residents were getting
sick.

The village of 1,600 people had one of the highest rates of multiple
sclerosis in the country, and residents suspected elevated cancer rates
were also tied to the site. Yet after more than a decade of trying, the
community couldn�t get the site�s current owners, which included Exxon, to
pay for the cleanup.

�The town was just sick,� Ms. Sims remembered. �They were sick of the
inaction by the regulators, and by these multinational companies.�

Determined to come up with a way to help, Ms. Sims went for an evening
jog. It is on these long, meditative runs that she says she talks with
God.

�I get along with the Holy Spirit and I�m just like, �Help me. Help me
help these people,�� she said. �And he said, �Fine them.��

Ms. Sims prayed on it. �I fine people every day for having dog poop in
their yards, tall weeds, broken windows,� she remembered thinking. This
wasn�t so different, she reckoned.

The next day, she pitched her boss on the idea. He was in. And in 2006,
Ms. Sims helped the village sue Exxon and the site�s other owners � for
littering.

The companies appealed, and the suit was initially dismissed on technical
grounds. But Ms. Sims filed an amended complaint and the case started
making its way through the court system. Years of procedural maneuvers
followed, and in 2013, the village settled with Exxon and the other owners
for almost $1 million. Exxon did not respond to a request for comment.

It wasn�t a lot of money, given the size of the problem, yet it set an
important precedent. With her novel legal strategy, Ms. Sims had brought
an oil giant to the bargaining table.

�Other law firms were like, �How did you do that?�� she said.

Even before that settlement, Ms. Sims had taken on her next big case. An
oil refinery in another small village, Roxana, Ill., had polluted the
groundwater with benzene, a carcinogen, and the site�s owners, Shell and
ConocoPhillips, wouldn�t clean it up.

Ms. Sims helped Roxana file 230 tickets against each company for littering
in traffic court, setting off another round of onerous litigation for some
of the country�s biggest fossil fuel companies. Once again, they settled.
In 2017, Shell and ConocoPhillips agreed to pay almost $5 million.

For Ms. Sims, it was validation of her hunch that the smallest of towns
could take on the world�s biggest companies.

In short order, Ms. Sims joined Milberg, one of the largest class action
firms in the world.

The firm was working on bringing cases against companies over the opioid
crisis, and sent Ms. Sims to Puerto Rico in 2017 to help build a case on
behalf of local governments struggling with the fallout from drug
addiction. Months later, Hurricane Maria hit.

After the storm, Ms. Sims returned to continue her work and was stunned.
�I could not believe the devastation,� she said. �Everything was leveled.
It looked like a bomb had gone off. It looked like Hiroshima.�

As she drove across the island to meet with local officials about the
opioid crisis, it occurred to her that Puerto Ricans were now suffering at
the hands of another set of corporations. Fossil fuel companies had warmed
the planet and misled the public about global warming, making billions
along the way. It wasn�t so different from what had happened in DePue and
Roxana, she thought.

Then, she said, God told her to sue Exxon again.

�The Holy Spirit tells me what to do,� she said. �This bomb that went off
here was climate change related. We just need to prove it.�

�I Hold Them Responsible�
The morning after Ms. Sims visited the cemetery in Puerto Rico, she was up
at dawn preparing for the day. With a recording of the Bible playing on
her iPhone, she applied her makeup and donned a pink corduroy suit and a
silk Gucci scarf, then marched out the door carrying a large Fendi
handbag.

�It�s a show of respect and confidence,� she said about the meticulous
care she takes with her appearance. �I�m meeting people all the time, and
you want them to know that you�re taking them seriously. That�s the way I
was raised.�

An hour later, she arrived in Caguas, a small city nestled in a lush
valley south of San Juan. Accompanied by an associate from her firm, Ms.
Sims greeted several city officials and unspooled the plan of attack.

She described how starting in the 1980s, companies including Exxon
understood that fossil fuel emissions would rapidly heat the planet, but
began a coordinated effort to conceal that information from the public.
How they waged a sophisticated lobbying effort to block the regulation of
emissions. How they sowed doubt around the increasingly conclusive science
of climate change.