Expand SAI section with cost, leverage, and monitoring details

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                                 <h4><i class="bi bi-gear"></i> Scientific & Technical Mechanism</h4>
                                 <p>SAI involves injecting reflective particles into the stratosphere (about 15–20 km altitude) to form a thin veil that reduces the amount of sunlight reaching the surface. Nature provides an analog: large volcanic eruptions (like Mt. Pinatubo in 1991) blast sulfate aerosols into the stratosphere and cause measurable global cooling for a year or two.</p>
-                                <p>To mimic this, SAI proposals commonly envision using sulfur dioxide (SO₂) gas as the precursor, which in the stratosphere converts into sulfate particles that scatter sunlight. To deploy, a fleet of high-altitude aircraft (or possibly stratospheric balloons or guns) would regularly release SO₂ at targeted locations, likely near the equator, to form a global haze. Because stratospheric aerosols fall out on a timescale of 1–3 years, <em>continuous</em> injections would be required to maintain a cooling effect.</p>
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+                                <p>To mimic this, SAI proposals commonly envision using sulfur dioxide (SO₂) gas as the precursor, which in the stratosphere converts into sulfate particles that scatter sunlight. To deploy, a fleet of high-altitude aircraft (or possibly stratospheric balloons or guns) would regularly release SO₂ at targeted locations, likely near the equator, to form a global haze.</p>
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+                                    <strong><i class="bi bi-lightning"></i> Extraordinary Leverage:</strong> The physics of stratospheric deployment provides remarkable efficiency. <strong>1 gram of SO₂ in the stratosphere offsets the warming effect of 1 ton (1 million grams) of CO₂ for one year</strong>—a <strong>1:1,000,000 leverage ratio</strong>. This is why SO₂ is <strong>~20 times more effective</strong> in the stratosphere than at ground level: the Brewer-Dobson circulation transports aerosols globally (east-west around equator, then poleward), and the lack of weather washout means particles remain suspended for 1–3 years rather than ~10 days in the troposphere.
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+                                <p>Because stratospheric SO₂ aerosols fall out on a timescale of 1–3 years (while atmospheric CO₂ persists for 100-1,000 years), <em>continuous</em> injections would be required to maintain a cooling effect. However, this short residence time also means the intervention is reversible—effects dissipate within years if deployment stops.</p>
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                                     <strong><i class="bi bi-lightbulb"></i> Termination Shock Context:</strong> Critics often cite termination shock as a major risk, but the economic math reveals this concern may be overstated. The world economy would need to shrink to <strong>less than $1 trillion</strong> (from current $100+ trillion) before SAI becomes unaffordable—a collapse so severe that rapid warming would be among many catastrophic problems. For perspective: the U.S. alone spent <strong>$5 trillion</strong> on pandemic relief, enough to fund SAI at full scale for <strong>250-500 years</strong>.
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+                                    <strong><i class="bi bi-person"></i> Per-Capita Cost Perspective:</strong> The average American emits <strong>16 tons of CO₂ per year</strong>. At optimistic deployment scale, offsetting this would cost <strong>~$3 per person per year</strong> (potentially as low as $0.15-0.30 at maximum efficiency). Globally, if every person paid <strong>$3 annually</strong>, it would reverse all anthropogenic warming. This is less than the cost of a single coffee—a trivial personal expense for comprehensive climate intervention.
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+                                    <strong><i class="bi bi-info-circle"></i> Material Sourcing:</strong> SO₂ is essentially a <strong>waste product from oil refinement</strong> (via the Claus process from sour oil and gas). One Middle Eastern oil company alone produces 10 million tons of elemental sulfur annually as industrial byproduct—more than enough to cool the entire planet by 0.5°C. Material cost: <strong>$100-200 per ton of sulfur</strong>. Current deployment costs from pilot programs: ~$0.28-1.00 per gram of SO₂ delivered to stratosphere.
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                                     <p><strong>Economic Reality Check:</strong> However, this concern must be weighed against SAI's trivial cost. At <strong>$10-20 billion per year</strong> to offset 1°C of warming, the global economy (currently ~$100 trillion/year) would need to collapse by <strong>99.9%</strong> before this became unaffordable. Any scenario where civilization cannot budget 0.01-0.02% of GDP for SAI is likely already catastrophic—making termination shock "a nightmare scenario on top of an existing nightmare," not an independent risk.</p>
 
+                                    <p><strong>Residence Time Context:</strong> The asymmetry in atmospheric persistence creates the termination risk: <strong>stratospheric SO₂ aerosols last 1-3 years</strong> while <strong>atmospheric CO₂ persists for 100-1,000 years</strong>. This means cooling effects dissipate rapidly if deployment stops, but also means SAI is reversible (unlike CO₂ accumulation). If SAI were abruptly terminated, warming would resume at the rate masked by the intervention.</p>
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                                     <p><strong>Historical Precedent:</strong> We're already experiencing mild termination effects. When shipping emissions were cleaned up (IMO 2020) and when the U.S. Clean Air Act reduced SO₂ emissions from 130 million tons/year (1979) to 70 million tons/year (2022), we unmasked warming. The world managed these transitions, demonstrating that gradual adjustments are feasible.</p>
 
                                     <p><strong>Mitigation Strategies:</strong> Termination risk can be managed through: (1) gradual ramp-down over decades rather than abrupt cessation, (2) parallel deployment of CDR to reduce underlying CO₂ levels, (3) international redundancy with multiple deployment nations/actors, and (4) treating SAI as critical infrastructure with budget protection similar to defense or public health. The commitment required is financial (trivial) and political (challenging but manageable), not technical.</p>
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                                     <p>A more subtle but pervasive impact of stratospheric aerosols is on the quality of light. Skies would likely become hazier worldwide – more diffuse white light rather than clear blue. Direct sunlight would be reduced. One consequence is a decrease in the efficiency of solar photovoltaic systems, which rely on direct sun – one study estimated a few percent drop in solar power output under a moderate SAI deployment. Additionally, the aesthetics of the sky would change: we might see milky-white days and vivid red sunsets.</p>
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+                                    <div class="alert-title"><i class="bi bi-exclamation-diamond"></i> Moral Hazard</div>
+                                    <p><strong>The Concern:</strong> Critics argue that SAI's low cost and rapid effectiveness create a "moral hazard"—if we can easily mask warming, society will lose incentive to decarbonize, leading to indefinite fossil fuel dependence and indefinite SAI deployment.</p>
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+                                    <p><strong>Counterargument:</strong> Market forces are already driving decarbonization independent of climate policy. Renewable energy (solar, wind, batteries) is becoming <strong>cheaper than fossil fuels</strong> in most markets due to technological learning curves and economies of scale. The transition to clean energy is economically advantageous, not merely a climate sacrifice. SAI doesn't change the fundamental economics making renewables competitive—it simply buys time to complete the transition without suffering catastrophic climate impacts in the interim.</p>
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+                                    <p><strong>Complementary Role:</strong> SAI and decarbonization are not either/or choices but complementary strategies. SAI addresses the <em>symptoms</em> (temperature, extreme weather) while decarbonization addresses the <em>root cause</em> (CO₂ accumulation). Optimal climate strategy likely involves both: aggressive clean energy deployment (already economically favorable) plus SAI as "insurance" against near-term climate damages during the multi-decade transition period.</p>
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                                     <strong><i class="bi bi-shield-exclamation"></i> Governance Challenge</strong>
                                     <p class="mb-0">Who gets to decide the global thermostat setting? How do we adjudicate if one region's suffering is caused by SAI? At present, there is no international framework that clearly covers or regulates solar geoengineering deployment. Many scientists call for expanded research <em>governance</em> but a <em>deployment</em> governance regime would be needed before any real use.</p>
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+                                    <strong><i class="bi bi-broadcast"></i> Monitoring & Measurement:</strong> SAI effectiveness can be precisely tracked via satellite monitoring. Current radiative forcing is measured at <strong>2.5 W/m²</strong> since the industrial revolution using instruments like <strong>Tropomi on the Sentinel-5P satellite</strong> (European Space Agency). These systems detect aerosol distributions, cloud properties, and radiative effects in real-time, enabling evidence-based deployment adjustments and transparent international verification.
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