Add Guidance Papers on the Cross Cutting Issues of the Third Assessment Report of the IPCC (2000)

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While investigating IPCC scenarios over time, I came across Guidance Papers on the Cross Cutting Issues of the Third Assessment Report of the IPCC, which includes "Uncertainties in the IPCC TAR: Recommendations to lead authors for more consistent assessment and reporting" by Moss & Schneider (2000). This is the origin of the IPCC uncertainty language I am eager to cite.

Adding the below

• Full Report; Pachauri and Taniguchi
• User's Guide; Taniguchi and Tanaka
• Costing Methodologies; Markandya and Halsnaes
• Uncertainties; Moss and Schneider
• Decision Analysis Frameworks; Toth
• Development, Equity and Sustainability (DES); Munasinghe
  Appendices
• Summary of First IPCC Expert Meeting on DES in Colombo, Sri Lanka; Munasinghe and Swart
• Short Report of IPCC Costing Issues Expert Meeting in Tokyo; Pachauri and Taniguchi
• Summary of Second Regional Expert Meeting on DES; Pichs et al.