Fiber-cement siding is durable and low-maintenance. Fine Homebuilding has produced an informative, short video for tips on Cutting Fiber Cement With a Circular Saw.
There’s some debate about how eco-friendly fiber cement is. It takes quite a bit of energy to produce the Portland cement that holds the boards together, and the cellulose sources may not be sustainable (although some products use recycled materials). But the final product should last a long time, so it’s a good option for siding.