The blue curve shows the evolution of the unperturbed sea-ice extent for the A1B scenario, with the gray shading showing the ensemble spread of three model runs.
蓝色曲线表示A 1 B方案中未受干扰的海冰范围，灰色阴影表示三个模型紧张的整体差幅。
2
A1 is divided into three groups that describe alternative directions of technological change: fossil intensive (A1FI), non-fossil energy resources (A1T) and a balance across all sources (A1B).
A 1分三组描述科技变化的交替方向：矿物资源集中(A1FI)，非矿物能源(A1T)和所有资源均衡(a1b)。