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Climate investing means owning companies whose emissions path fits a warming limit of 2°C (3.6°F) or lower. Most diversified portfolios miss that mark. The S&P 500's Implied Temperature Rise is now 4.0°C (7.2°F), based on carbon emissions data from September 2026. That's double the Paris Agreement's 2°C (3.6°F) goal.
There are two reasons to act: the damage a 4°C (7.2°F) world would do, and the returns available from the companies that help prevent it.
The S&P 500 a on a trajectory to about 4.0°C (7.2°F) of warming by 2100, based on carbon emissions data from September 2026. That figure is the index's Implied Temperature Rise (Global Warming Potential): the warming the world would see if the whole economy emitted like its companies. The Intergovernmental Panel on Climate Change (IPCC) places 4°C (7.2°F) inside its very high emissions scenarioSSP5-8.5 project 3.3°C to 5.7°C (5.9°F to 10.3°F) of warming by 2081–2100, compared with 1850–1900.
A 4°C (7.2°F) world would be hotter than any time in over 3 million years. It would bring higher seas, more destructive storms and large-scale species loss, and much of that damage couldn't be reversed.
A 4°C (7.2°F) world would be warmer than any time in over 3 million years. The last time Earth was 2.5°C to 4°C (4.5°F to 7.2°F) warmer, sea levels were 16 to 82 feet higher than today.
The speed of the change is as alarming as its size. When Earth came out of past ice ages, global temperatures rose 4°C to 7°C (7.2°F to 12.6°F) over about 5,000 years, according to NASA. This century, NASA expects warming to run at least 20 times faster. The cause is just as fast: carbon dioxide from human activity is rising about 250 times faster than it did from natural sources after the last ice age.
Past warm periods came from slow shifts in Earth's orbit that played out over thousands of years. Ecosystems, coastlines and farming regions had millennia to adjust. A 4°C (7.2°F) trajectory gives them decades.
Rising seas could push more than half of Miami-Dade's 2.6 million residents from their homes. A 2023 Columbia University study found that 40 inches of sea level rise would put 56% of residents under pressure to relocate. The Southeast Florida Regional Climate Change Compact projects up to 54 inches by 2070.
A single 100-year storm surge would destroy about 10% of the market value of Miami-Dade's residential real estate, McKinsey estimates. That storm has a 26% chance of hitting during a 30-year mortgage. Seawalls can't stop the water, because Miami sits on porous limestone and seawater seeps up through the ground. Tidal flooding in Miami Beach rose from 2 events in 1998–2005 to between 8 and 16 in 2006–2013.
Miami is already paying. In 2017, City of Miami voters approved the $400 million Miami Forever Bond, and $192 million of it goes to sea level rise and flood prevention.
A 4°C (7.2°F) world would put a large share of species at risk. The IPCC's Working Group II finds that up to 39% of land species would likely face very high extinction risk at 4°C (7.2°F). In its public FAQ, the IPCC says 4°C (7.2°F) of warming would threaten every second known plant or animal species.
Much of the damage from warming is permanent on a human timescale. The IPCC finds that many changes, especially in the ocean, ice sheets and sea level, are irreversible for centuries to millennia. A child born in 2026 will be 74 in 2100. That child will live in whatever climate today's capital finances.
Solving a problem this large directs trillions of dollars a year toward the companies that solve it. Owning those companies can pay off, as long as financial quality comes first.
The world will spend about USD 2.2 trillion on clean energy in 2026. The International Energy Agency's World Energy Investment 2026 report expects that money to go into renewables, nuclear, grids, storage, low-emissions fuels, efficiency and electrification. About USD 1.2 trillion goes to oil, gas and coal.
That USD 2.2 trillion becomes orders for companies Ziggma has researched. First Solar is a US-based maker of thin-film solar panels. Nextpower, formerly Nextracker, makes trackers that turn solar panels to follow the sun. GE Vernova builds wind turbines and grid equipment. EnerSys makes batteries and energy storage systems.
Clean technology now wins on price. The IEA estimates that innovation has cut the cost of electric vehicles, battery storage and solar panels by around 80% over the past decade. Cheaper batteries are the economics behind electric vehicle makers like Rivian.
Renewables passed coal in the global power mix in 2025. Ember's Global Electricity Review 2026 found that renewables generated 33.8% of global electricity that year, ahead of coal at 33.0%. That's the first time in about a century.
Companies that own clean power plants sell into that growing share. Clearway Energy owns wind, solar and storage assets and sells their output under long-term contracts. Ormat Technologies runs geothermal plants, which generate power around the clock.
Investors are getting better emissions data from large US companies. California's SB 253 requires US companies with more than $1 billion in revenue that do business in the state to disclose Scope 1 and Scope 2 emissions from 2026. Scope 3 disclosure follows in 2027.
The long-term return evidence is encouraging. A Schroders and Oxford Saïd Business School study found that 8 of 10 randomly built impact portfolios beat the MSCI ACWI IMI from 2010 to 2023.
Owning the climate theme isn't enough. Clean energy stocks fell hard after their early-2021 peak. The IEA notes that about three-quarters of expected 2026 energy investment rests on decisions made before the Middle East conflict began. That means energy security pressures may keep some fossil fuel spending going longer. Climate solutions companies with strong fundamentals are the ones most likely to turn the transition into returns.
Investors have five ways to lower a portfolio's climate impact. Each works alone, and they work better together.
A fossil-free portfolio removes companies that extract, produce or mainly distribute coal, oil or gas. It's the simplest lever to apply. It's also the bluntest, because it ignores how fast the remaining companies are decarbonizing. See the guide to building a fossil-free portfolio and the best fossil-free stocks for 2026.
Climate solutions companies earn revenue from renewables, grids, storage, electrification or efficiency. Owning them adds exposure to the capital flows the IEA tracks. Quality varies widely within the theme, so fundamentals still matter. Ziggma ranks candidates by Ziggma Stock Score in its lists of the best renewable energy stocks, best solar stocks, best climate stocks, best climate tech stocks and best sustainable stocks.
Reducing your portfolio's temperature starts with measuring it. Implied Temperature Rise (ITR) estimates how much warming the world would see by 2100 if the whole economy behaved like the companies you own. Below 2.0°C (3.6°F) fits the Paris Agreement's headline goal. Above 3.0°C (5.4°F) signals heavy exposure to high emitters without credible transition plans. Ziggma shows ITR as Ziggma Global Warming Potential. Start by checking your portfolio's climate score, then read how portfolio temperature alignment works and what the climate impact of your investments looks like.
S&P 500 Implied Temperature Rise based on carbon emissions data from September 2026. Estimates from other providers vary by methodology.
Screening filters the market by climate data before you buy. Useful filters include maximum temperature alignment, net-zero target date, carbon intensity trend and share of energy from renewables. Ziggma's impact data comes from ACA Ethos. The net-zero screening guide walks through the filters step by step.
Owning shares directly gives you proxy votes on climate resolutions and board members. Fund investors usually hand that vote to the fund manager. Direct ownership through a brokerage account keeps it with you. See how active shareholder investing works.
Your broker tells you what your portfolio is worth. Ziggma shows you its climate impact, and how to lower it without giving up financial quality.
Ziggma analyzes more than 30,000 stocks and funds, and rates every investment on both financial quality and impact.
*Backtested results are hypothetical, before tax and include trading costs. The margin over the S&P 500 isn't statistically significant over the period. Past performance doesn't guarantee future results.
Ziggma is subscription-funded. It isn't a broker or a fund manager, so it has no incentive to push trades or products. You keep full control of your investments in your existing brokerage account.
Plans that include the Ziggma Impact X-Ray start at $6.99 a month, billed annually.
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The Ziggma Stock Screener has Impact filters for maximum Global Warming Potential, net-zero target date and minimum share of renewable energy. Adding a Ziggma Stock Score filter keeps financial quality in the shortlist. The score covers Growth, Valuation, Profitability and Financial Health.
The Ziggma Portfolio Optimizer shows how a buy or sell changes your diversification, portfolio quality and Impact Score before you trade. It can't yet target Global Warming Potential directly. Use the Screener first to find lower-temperature holdings, then the Optimizer to test them.
Ziggma doesn't calculate a carbon footprint in tonnes of CO₂e. Global Warming Potential is forward-looking, and it maps directly onto the Paris targets.
