地球温暖化は深刻な問題だ

N3 地球 chikyuu Earth, planet Earth N3 温暖 ondan mild climate, warmth N3 深刻 shinkoku serious, grave, severe N5 問題 mondai problem, question

N4 地 chi, ji ground, earth, sol N3 球 kyuu / tama ball, sphere, balle N2 温 on / atata.ka, atata.kai, atata.maru, atata.meru, nuku warm, chaud, templado N1 暖 dan, non / atata.ka, atata.kai, atata.maru, atata.meru warmth, chaleur, templado N3 化 ka, ke / ba.keru, ba.kasu, fu.keru, ke.suru change, take the form of, influence N3 深 shin / fuka.i, -buka.i, fuka.maru, fuka.meru, mi- deep, heighten, intensify N3 刻 koku / kiza.mu, kiza.mi engrave, cut fine, chop N4 問 mon / to.u, to.i, ton question, ask, problem N4 題 dai topic, subject, sujet

N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information