Losing the ecosystem services the Earth provides would cause serious economic and health problems for everyone. Clearly, they are too valuable ______. 
(A)for lose
(B)to lose
(C)for losing
(D)to be losing

too (+ adj./adv.)…to (+ V) 意為「太…不」，如 He is too old to walk fast. (他太老而走不快)，但在表示下列意思的形容詞中，too…to 並無否定意義，此時 too 相當於 very：

易於：ready, apt, inclined, liable, easy, prone, likely
渴望：anxious, eager
樂意：willing, forward

He is too ready to speak ill of others. (他易說別人壞話)
I am too apt to oversleep myself on holidays. (假日時我很容易睡過頭)
Many people are too anxious to get rich. (許多人非常渴望致富)
John was too willing to take my advice. (約翰很樂意接受我的忠告)

此外，若在 too 的前面加上 all, but, only 等字，那麼 too…to 也無否定意義，此時 all too = but too = only too = very。例如：

My first love came to an end all too soon. (我的初戀很快就結束了)
I’m only too pleased to inform you that your application has been accepted.
= I’m very pleased to inform you that your application has been accepted.
(我非常高興地通知您，您的申請已被接受)


http://blog.cybertranslator.idv.tw/archives/848

損失地球所提供生態系統的運作，對每個人而言將導致嚴重的經濟及生命健康問題。顯然地，這個生態系統是太珍貴而不能失去。too ... to...