## GREEN INNOVATION AND DIFFUSION: POLICIES TO ACCELERATE THEM AND EXPECTED IMPACT ON MACROECONOMIC AND FIRM-LEVEL PERFORMANCE

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### Motivation and research questions
- Green innovation is described as a key ingredient in the fight against climate change and its adverse consequences for economic and financial stability, and as having potential to buffer the possible direct adverse impact of climate policies on economic activity.  
- Central questions examined by the Research Department (RES) include:
  - What is the impact of green innovation on economic activity?
  - Which climate policies stimulate green innovation?
  - Do climate policies stimulate deployment of green technologies through trade and FDI?
  - What are the cross-border spillovers of climate policies?

### Main findings — macroeconomic and firm-level impacts
- Green innovation has a positive impact on economic activity, buffering potential adverse impacts of climate policies:
  - Innovation measured by patents yields higher GDP levels over the medium-term, mitigating the potential costs of compliance with climate policies.
  - The economic impact of green innovation is comparable to that of nongreen innovation and to the impact seen in previous technological breakthroughs (ICT).
  - The impact of low-carbon technology (LCT) patents on GDP operates through investment; productivity gains may appear at longer horizons as production processes become greener.
- At the firm level:
  - Green patents boost firm revenue, but less so than nongreen patents, reflecting production systems’ reliance on nongreen technologies.
  - Firm-level heterogeneity exists: breakdown of US publicly listed firms by green intensity shows varying effects across firms with different shares of green patent filings.

### Climate policies and their measurement
- Main data sources:
  - Climate Policy Database — policy count variable with comprehensive coverage across measures, sectors, countries (including EMDEs).
  - OECD Environmental Stringency Index (EPS) — captures intensity of policies but for a smaller set of countries and policies.
- Climate policy instruments classified into three groups:
  - Generating government revenues: Carbon taxes and other taxes/fees; Emission trading schemes.
  - Generating government expenses: Subsidies (feed-in tariffs, R&D); Other (e.g., loan programs).
  - Budget neutral: Regulations; Other less binding instruments (e.g., government strategy documents and voluntary emission reduction targets).

### Effects of climate policies on innovation (patenting)
- Adoption of climate policies boosts green patent filings and overall innovation:
  - Regulations, emission quantity-limiting policies (ETS), and FITs/subsidies boost green patents.
  - Climate policies have a positive impact on both green and overall patent filings — not merely substitution from carbon-intensive to green technologies.
- Global coordination and key climate events matter:
  - Global policies have a larger effect on domestic green patent filings than domestic policies, pointing to the role of market size and technological spillovers.
  - Domestic policies around key climate policy landmarks show higher impacts, reflecting the importance of policy certainty.

### Deployment of LCTs through trade and foreign direct investment
- Deployment is crucial to close EMDEs’ emissions gaps:
  - Evidence shows positive signs of deployment through rising shares of LCT trade and growth in global green FDI flows and projects.
  - Emission counterfactuals indicate substantial potential reductions if firms with emission intensities above the AE median reach the AE median emission intensity while keeping production constant.
- Climate policies accelerate LCT deployment via trade and FDI:
  - Climate policies are associated with higher LCT imports and incentivize green FDI inflows, with no robust adverse impact on overall FDI.
  - Effects are stronger for green FDI into EMDEs; some sectoral FDI may be adversely affected.
- Policy instrument effects on FDI:
  - Revenue measures (taxes and emission trading schemes) and expenditure measures (subsidies/FITs) are effective in boosting green FDI inflows.
  - Expenditure measures can reduce green FDI outflows in the short to medium run, indicating a potential tension between domestic incentive design and outward investment.

### Trade policy, tariffs, and protectionism risks
- Lowering LCT tariffs raises LCT trade and green FDI inflows:
  - EMDEs generally face higher LCT tariffs, implying scope to accelerate deployment via tariff reductions.
  - Results point to risks of protectionism for LCT deployment; higher tariffs or protectionist measures can hinder LCT imports and green FDI into EMDEs.

### Cross-border spillovers and international coordination
- Climate policies have significant cross-border spillovers:
  - Countries implementing climate policies tend to increase green FDI outflows, except that expenditure measures may reduce outflows.
  - Advanced Economies’ (AEs) climate policies stimulate global deployment through LCT trade and green FDI, but some policies (notably subsidies) can hamper green FDI outflows, creating potential tensions between domestic and international objectives.
- Implications for international cooperation:
  - Synchronizing global climate action can boost green patenting via market-size effects and technology spillovers.
  - Avoiding a subsidy race and protectionist measures is important to prevent hampering deployment to EMDEs with lower fiscal space.
  - Policies should be designed to be consistent with WTO rules, including avoiding local content requirements.

### Scope for direct technology transfers and compensation to innovators
- There is large potential for reducing emission intensity in EMDEs through technology transfers:
  - Past examples (Montreal Protocol, Green Revolution) highlight the role of government-led transfers managed through international organizations.
  - Current initiatives in LCT technologies include CTCN, GCF, and TEC (examples mentioned).
- Compensation mechanisms for innovators are crucial:
  - Government-sponsored technology transfers would require either buying patent rights from innovators or publicly funded R&D in LCTs.

### Policy recommendations and conclusions
- Boost the stock of climate policies and lower trade costs affecting LCTs to accelerate green innovation and deployment:
  - Revenue measures limiting emission quantities and expenditure measures such as subsidies foster green innovation and deployment through trade/green FDI.
  - Lower tariffs on LCT goods strongly promote deployment through trade and FDI.
- International coordination and cooperation are crucial:
  - Synchronize global climate action to leverage market size and technology spillovers for innovation.
  - Avoid growing protectionism that would stifle innovation and deployment.
  - Mitigate adverse impacts of subsidies, avoid a subsidy race that would hamper deployment to EMDEs with lower fiscal space, and ensure policy consistency with international trade rules.
  - Explore direct technology transfer mechanisms and ensure appropriate compensation to innovators.

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_Source: https://www.imf.org/-/media/files/oap/oap-home/2024/green-innovation-and-diffusion-sdn-outreachapd.pdf_