本文中，使用一個兩部門的內生成長模型來探討經濟成長與環境品質是否能兼得的問題。得到以下幾點結論：（1）均衡時，產出、消費、防污知識、實體資本都以固定的成長率成長，而污染存、流量的均衡值為固定水準（成長率等於零），亦即在經濟發展的同時，可維持一定的環境品質。（2）政府若欲以提高用於研發的資本的價格，來鼓勵發展防污技術進而減少污染，是可以達到目的的，但是需以成長率的降低為代價。（3）政府若以提高污染稅來改善環境品質，在污染的存、流量對生產的影響和為負的情形下，改善環境品質的同時亦提高了經濟成長率。

　　　　　We report a very rare case of systemic sclerosis in a 6-year-old girl. She presented with diffuse scleroderma, Raynaud's phenomenon, pulmonary interstitial fibrosis, pulmonary hypertension, and right ventricular failure. The diagnosis was confirmed by skin manifestations, high resolution computed tomography, cardiac catheterization, and anti-nuclear antibodies. Nifedipine, prednisolone, digoxin, and furosemide were given. There was remission of the right ventricular failure and dyspnea, and the skin showed partial improvement. The patient remained asymptomatic for a year. The symptoms of respiratory and right heart failure developed again after an episode of lower respiratory tract infection and she eventually died. We discuss the clinical manifestations, treatment, and outcome that the emissions and the stock of pollution have a negative effect on production, the steady state level of the pollution stock will be lower than in the social planner's optimal solution. In the last case, the growth rate increases.