What are two important considerations while planning for environmental concerns?

The focus on orientation in relation to the sun and the appropriate time of year to build underscores key aspects of sustainable architectural design. By considering the sun's path, architects can optimize natural lighting and heating, potentially reducing energy consumption. Strategic orientation can enhance passive solar gain in the winter, providing warmth, while minimizing heat during the summer months through shading.

Planning construction around the appropriate time of year also plays a critical role in environmental considerations. Seasonal weather patterns can impact construction timelines and methods, as activities like pouring concrete or roofing may be affected by rain or extreme temperatures. Additionally, building at the right time can align with ecological cycles, minimizing disruptions to local wildlife and ecosystems.

Other considerations mentioned in the options, such as building materials and waste management, are also significant for sustainability, but they pertain more to the lifecycle of the building rather than its immediate environmental integration during the planning phase. Therefore, the emphasis on sun orientation and timing is pivotal when addressing environmental concerns from an architectural viewpoint.