A company in "Climate Modelling Software" creates and develops specialized software programs that simulate and predict different aspects of climate change. These programs take into account various factors such as temperature, humidity, wind, and precipitation. Scientists use these models to make predictions about future climate trends and understand current climate conditions. These companies may also provide tools for visualizing, analyzing, and interpreting the output from these models for use in research and policy-making.

1. Climate Modelling Toolbox (CMT): It is an open-source software used for building and analyzing climate models.  

2. Community Earth System Model (CESM): Used by atmospheric scientists who study climate, it offers one of the most comprehensive models of the global weather system.  

3. NOAA's Geophysical Fluid Dynamics Laboratory (GFDL) models: NOAA offers a range of global models for atmosphere and ocean circulation, including the AM3 atmosphere model.  

4. Integrated Assessment Models (IAMs): IAMs combine economics, energy systems, and simple climate models, allowing scientists to understand and predict the effects of climate change policies.  

5. Model for Evaluation of Regional and Global Effects of GHG Reductions Policies (MERGE): MERGE is a software model for exploring the interplay of energy technology, economics, and climate change.  

6. Environmentally Extended Input-Output model (EEIO): EEIO analysis quantifies the environmental impact of each economic transaction in an economy, which can be used to study the environmental impacts of different policies or sectors.  

7. NASA's Goddard Institute for Space Studies ModelE: A series of global agnostic models used in attributing climate change and predicting its future evolution.  

8. Weather Research and Forecasting model (WRF): A highly configurable, state-of-art model for atmospheric research.  

9. MIROC (Model for Interdisciplinary Research on Climate): A global climate model developed by several research organizations in Japan, widely used for Intergovernmental Panel on Climate Change (IPCC) assessment reports.  

10. MAGICC/SCENGEN (Model for the Assessment of Greenhouse Gas Induced Climate Change/SCENario GENerator): A suite of models for evaluating the impacts of different emission scenarios on global and regional climate.  

11. Integrated Global System Modeling Framework (IGSM): IGSM is an integrated assessment model of the global climate system developed by the Massachusetts Institute of Technology (MIT).  

12. Energy-Environment-Economy Model at the Global level (E3MG): E3MG is a dynamic global macro-econometric model for medium- and long-term simulations developed by Cambridge Econometrics and the University of Cambridge.  13. General Earth System Model of the Max Planck Institute for Meteorology (MPI-ESM): A comprehensive coupled atmosphere-ocean-sea ice-land surface model, used in recent IPCC reports.

Climate modeling software plays a significant role in decarbonization in several ways:  

1. Understanding Climate Impact: Climate modeling software enables us to understand the impact of carbon emissions on the global climate. This understanding is key to making effective plans for decarbonization.  

2. Scenario Planning: Climate models can simulate different scenarios based on varying levels of carbon emissions. This can help policy makers and companies make informed decisions about the best strategies for decarbonization.  

3. Risk Assessment: The software can be used to assess the risks associated with different levels of carbon emissions. This can help in the prioritization of decarbonization efforts.  

4. Tracking Progress: Climate models can be used to track the progress of decarbonization efforts. They can help identify whether current strategies are working or if new approaches need to be considered.  

5. Forecast Future Conditions: Climate modelling software can predict future climatic conditions based on different decarbonization strategies. This helps in making long-term plans and setting realistic and impactful climate goals.  

6. Identify Effective Strategies: By comparing the outcomes of different climate models, we can identify the most effective strategies for decarbonization. This saves time, resources, and ensures that the strategy employed will best serve the intended purpose.  

7. Public Awareness: Climate modeling can visually demonstrate the catastrophic impacts of unchecked carbon emissions, helping to raise public awareness and support for decarbonization efforts.  

By offering insights and predictions about the impacts of carbon and potential outcomes of different strategies, climate modeling software becomes a crucial tool in efforts to decarbonize and mitigate climate change.

Selecting a climate modeling software vendor involves careful evaluation of your business needs, the functionality of the software, reliability of the vendor, and how well they align with your company's decarbonization goals. Here are some steps to take:

1. Determine Your Needs: What specific goals does your company hope to achieve through the software? This could be monitoring your company's carbon footprint, assessing the impact of potential changes, or simulating the effects of different strategies on carbon emissions. Your goals will help define the features you need from the software.
2. Consider Budget: Determine your budget for the software. This will allow you to recognize which vendors are within your price range.
3. Research Vendors: Look for reputable vendors in climate modeling software. You can find this information through industry publications, online reviews, recommendations, etc.
4. Evaluate Software: Examine the different features offered by each vendor. Do they provide emission tracking, data management, simulations, impacts of different decisions, etc.? Are they simple enough to use, or would your company need additional training?
5. Understand their Data Security: As this software will collect and analyze sensitive business data, it's important to understand the vendor's data security measures.
6. Request Demos: A practical demonstration will give you a better understanding of how the software works and whether it can meet your needs.
7. Check for Customer Support: Efficient customer support means your concerns and queries will be addressed in a timely and efficient way.
8. Compare Pricing and Packages: What's included in the price? Are there additional costs for extra features, service levels, or customer support?
9. Ask for References: Ask the vendor to provide references or to connect you with their existing customers. Their experiences will give you insight into the software's effectiveness and the vendor's reliability.
10. Review Customization Options: Can the software be customized to suit your specific needs? Special functions developed for your unique needs can enhance your efficiency.

Consider creating an RFP (Request for Proposal). This allows you to put forward your needs and enables vendors to propose their solutions, functionality, prices, and added services. From received proposals, you can create a shortlist, arrange demos, and negotiate terms. This process helps in impartial selection.

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