Çevre Ekonomisi ve Tarım
Özet
Bu bölüm, tarımsal faaliyetlerden kaynaklanan çevresel etkileri çevre ekonomisinin temel kavramlarıyla (dışsallıklar, kamu malları ve ortak havuz kaynakları) ilişkilendirerek tarım–çevre etkileşiminin iktisadi boyutunu açıklamaktadır. Tarımsal kirliliğin önemli bir kısmının noktasal olmayan (dağınık) nitelik taşıması nedeniyle ölçüm, izleme ve kaynağa atfetme güçlükleri vurgulanmakta; bu durumun politika tasarımında hedefleme, uygulanabilirlik ve maliyet-etkinlik kriterlerini öne çıkardığı gösterilmektedir. Bölümde fayda-maliyet analizi, maliyet-etkinlik analizi ve çevresel değerleme gibi analitik araçlar kısaca tanıtılmakta; tarımın gübre/pestisit kullanımı, su çekimleri, hayvancılık kaynaklı emisyonlar, arazi kullanımı ve atık yönetimi üzerinden toprak, su ve hava/iklim üzerinde yarattığı baskılar ekonomik bir çerçevede değerlendirilmektedir. Bu etkilerin sağlık maliyetleri, arıtma/iyileştirme harcamaları, ekosistem hizmetlerindeki kayıplar ve uzun dönemli riskler yoluyla refaha yansıması tartışılmakta; son bölümde düzenleyici, ekonomik ve bilgi temelli araçların güçlü/zayıf yönleri karşılaştırılarak uygulanabilir karma politika yaklaşımlarına ilişkin öneriler sunulmaktadır.
This chapter examines the economic dimension of agricultural environmental impacts through the core concepts of environmental economics, emphasizing market failures such as externalities, public goods and common-pool resources. Because many agricultural pressures are predominantly nonpoint-source, the chapter highlights monitoring, attribution and enforcement constraints and explains how these constraints shape feasible and cost-effective policy design. It briefly introduces key analytical tools—cost–benefit analysis, cost-effectiveness analysis and environmental valuation—and reviews the main channels through which farming affects soil, water and air/climate, including fertilizer and pesticide use, water withdrawals, livestock-related emissions, land-use pressures and waste management. The discussion links these impacts to welfare outcomes via health damages, remediation and treatment costs, losses in ecosystem services and long-run economic risks. Finally, the chapter compares regulatory, economic and information-based instruments and outlines practical directions for monitorable and incentive-compatible policy mixes in the agricultural context.
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