已知数列{a_n}满足a₁=1，a_n+1=2a_n+1．

（1）求数列{a_n}的通项公式；

（2）令b_n=$\frac{1}{2}$n（a_n+1），求数列{b_n}的前n项和T_n．

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关于数字地球的叙述，正确的是（    ）。

①数字地球是数字化的地球　②数字地球已能满足人类目前的需要　③数字地球的最大特征是虚拟现实　④数字地球采取集中方式存储信息